stalling

Try unplugging the square 4 wire connector on the side of the trans.Sometimes the torque converter clutch can stick on causing what you describe. its kind of like letting the clutch out in gear when it is stuck on

Engine Performance problem
1991 Chevy Blazer 6 cyl Two Wheel Drive Automatic

I have a 1991 s10 blazer with a 4.3 liter v6 tbi(throttle body injection).xmas eve I was driving to my dads house and I stopped to get some gas.well,after I filled up with gas I left car started fine.I drove about three blocks and I came to a red light and the truck started shaking and vibrating really bad and stalled.so I tryed starting the car back up and it does start but shakes really bad and pops and seems to be running really rich maybe.but if I hold the gas petal at about 2000 rpm the truck will run not normal but I will run.once I left off the gas petal the truck starts shaking and vibrating popping and dies.so I thought I may have water in my gas so I added some stuff to the tank that removes water that didn't work.I then changed the spark plugs and the wires also a new fuel filter.I tested to see if the fuel pump was working and it appears t be working just don't know if its working properly.I have not done anythng else since kind of don't know what else to do.like I said the truck starts but the only way it stays running is when I press down the accelerator some once I let off its shakes and kills.also like I said it maybe running rich.hope this explains the problem enough where someone may know what I can do or try next.if you have any questions please contact me @ sbrandonjr26@gmail.com or 504 442 1167 my name is scott

Clean out the idle air control valve and EGR valve and then test the throttle position and manifold absolute pressure sensors to include a fuel pressure check-

[quote:1a3eefcd72="rasmataz671"]Clean out the idle air control valve and EGR valve and then test the throttle position and manifold absolute pressure sensors to include a fuel pressure check-[/quote:1a3eefcd72]thanks for the help tomorrow I will donate I have to put money on my pre paid card.where can I get a picture of mt motor that shows where all these parts are cause I have no idea where the idle air control valve is on that motor its an old truck also I have no idea what the egr valve is or where it is or the sensors.maybe I should go to the auto store and buy a manual unless you know of a place on the web.the fuel pump is not that old but like you said it may be faulty.when I removed the fuel filter I had my wife turn on the key and it did spray fuel from the fuel line where the filter goes maybe its not enough.would it be a good idead to buy all these parts new and just change them untill the problem is fixed?anyway I will try these and let you know what hapens......scott

a faulty egr valve will give the symptoms you have described. the egr may need cleaned but most of the time its easier to replace it. if the egr isn't electronic take the vaccum line off of it and plug it and see what it does. Should run better with it un hooked if its no good. I don't remenber exactly what the fuel pressure should be, but its a low pressure system so probably around 9-13 psi.

I had the same problem, with no codes. I pulled the fuel line off and it worked fine, but I did not check fuel pressure.
When I unplugged the temp sensor on the front of the engine, it ran at a crazy high idle.
Well, it turns out it was a 2 inch hose, inside the fuel tank was split. It went from the fuel pump to the housing. When the pump began to build up pressure, the line opened up and shot fuel BACK into the tank.
That caused the throttle body to starve for fuel, thus running like crap, then running great, then running like crap again.
It was a 1 dollar fix, but I had to drop the tank to access the pump.

Engine problem
1991 Chevy Blazer V8 Four Wheel Drive Automatic 154000 miles
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i have a 1991 k5 blazer and i just about have everything running good with it rebuilt tranmission motor in shape etc. well i was griving it around and it dies on me the whole engine just cuts out no power steering or brakes so i coast in to a parking lot and pop the hood to see if anything poped loose everything is in order so then i go back to the cab to try and start it up. my check engine light does not light up like it originally does before starting and my engine does not seem to turn over it just sits there and whines as if it wants to start but can not please help!!!!! thank you!!!

Well maybe first you should check your starter, make sure it is catching. If it does not catch the fly wheel you will hear and whineing noise. Also make sure all your control relays are working. I have a 88 surburban, the starter was bad in it, and would not crack at all, all it would do is spin the starter, also the check engine light didnt come on but we had to run a hotwire for my fuel pump which made it come back on.

Engine Performance problem
1991 Chevy Blazer V8 Four Wheel Drive Automatic 151000 miles

I have replaced my fuelpump, filter,strainer, and relay. I changed the pump 2 times, each time my truck will run for a day or two very well. After that my truck will stall out. I can start it up but it runs very bad. If I let it cool down it will start and run ok tell it gets warm. what could cause this??? is there something that could cause 2 pumps to go bad?

I saw what you replaced. Did you do any testing before you replaced anything? How is the fuel pressure? Are there any codes? The cts could cause the vehicle to act-up after it got warm. I'm not saying replace anything, you need to do some testing.

Can you test the amp draw for the pump?

Engine Performance problem
1991 Chevy Blazer 6 cyl Four Wheel Drive Automatic 170000 miles

enginestarts&runs 10 seconds&stops,afterabout6tries
it runs perfect. as long as the engine is warm it will
start & run perfect

Inspect and test the fuel pump relay and the fuel pump/oil pressure sending unit

Dear Sirs,
I have replaced the fuel pump relay and also the oil
pressure sending unit. it made no difference.
have any more ideas & . thank you.

Check the fuel pressure if its within specs and for injection pulses from the injector/s-could also be coming from the ignition switch or the computer itself

Or try this don't do 6 tries just one don't start do below to find out what's causing it if its fuel or spark problem

Engine Mechanical problem
1991 Chevy Blazer 6 cyl Four Wheel Drive Automatic 146000 miles

While driving my oil pressure just dropped to almost zero. my check gauges light came on. The truck ran fine until i pull up to a stop light. It idled for a minute and then died. I put it park and it started right up. For it not to die at a stop light i have to keep one foot on the gas and one on the brake at the same time to keep the idle high enuff to keep it from dying. What do i need to do to fix this?

The oil pump shaft has snapped and has thrown the timing off. This is bad because your engine is running without an oil pump!