Engine runs rough?

I am mechanically inclined but where to I hook it up at? Do I need to do before the fuel filter or does it matter just incase my filter is the problem.

Pressure was at 31 or 32 psi. Depending on the marks between. Also I did your test on the fuel pressure regulator and that checked out. Now when I turn the key the pressure gauge goes up but not to the 30 range. And when I rev it up the gauge goes up 3 or 4 psi.

Does it matter that I have a dual tank? What are the odds of both being weak? Is that common? It could be my gauge also. Since when I turn on the key the gauge doesnt move at all. And I tried it on my other newer vehicle and it has a new fuel pump and same results.

I have a 5.8 engine. The distributor recently shorted out and had to be replaced. I also had a major tune up. The engine had never ran rough before this. It will run rough when cold and drop about 800 rpm every couple seconds. It seems worse during acceleration. My mechanic tested all of the cylinders and says everything is as it should. He ran a fuel injection cleaning. Problem still there. He says fuel pressure is good and all electrical is working. Could you please help

The mechanic checked spark on all of the wires and plugs and said they are all firing. The computer is giving no trouble codes. The rough running seems to get better after about 15 minutes when the truck has really warmed up

Went to work, ran smooth, but when I got off work, it ran rough. Could this be an issue with the valve push rod? If so, do you know aprox how much it cost to repair or is it something a novice can do? Thank you

Hello. My truck runs a bit rough on idle and hesitates and misses under load. Im in the process of checking ignition timing and have tried to locate a spout connector but no joy. The timing light shows its either way off or somethings wrong. How do I adjust the ignition timing? Ive checked the distibutor and rotor everything is relitivly new from previous owner.

Well ive timed the ignition and replaced plugs cap rotor and checked leads. Cylindr 2 is not working. The plug is sooted and dry. Im thinking it may be an injector and hopefully not rings. The engine does not smoke at all.

Are injectors a common problem on these trucks?

Hello. I have a 1993 Ford F-150 4x4, Inline 6-cylinder engine, stick shift with 218,000 miles. The truck does have dual fuel tanks.

Symptoms: Smell gasoline, quits when started first time (unless I kick the accelerator quick a couple of times), rough idle, and "jumps" or surges when you drive her. The idle is so rough you can hear it when it is idling. Last, I smell exhaust (and smell like it at times when I get out of the truck).

My truck is at my mechanic and he has gone over it from front to rear; he set the timing, but when he set the timing correctly, the truck ran worse!

The truck has had a tune-up recently (plugs, wires, cap, rotor button, fuel fileter, PCV Valve, and air cleaner). Mechanic said that when he disconnected a "round switch on the motor block that controls the vacuum", it ran a little bit better, but the check engine light came on.

Any advice is helpful; my mechanic is very honest, but neither of us want to start replacing things without knowing what direction to head in. Thank you for any assistance!

PS: Don't know if this is helpful, but gauge for rear fuel tank began working intermittently when all these problems started (it had not worked for four years). Also, fuel goes from one tank to the other (Ford dealer alledgely fixed with a recall, but I am doubtful).

The truck has a good idle, but anywhere from 45mph up you have to the rpms above 1800 or it shakes violently. Its not wires or plugs and the motor mounts are fine. Also it will die when turning the wheel while in reverse.

No codes pull up, and its not the tires because it quits shaking when I let of the gas, also the ujoints are good