Rough idle, engine miss at medium throttle

Just replaced all of the o2 sensors and exhaust gaskets. Because it had a p1133 code truck runs good with a rough idle when coming to a stop I have not replaced the timing yet. What could cause that idle to go 880 rpm to 920 rpm with no vacuum leaks.

I hooked up the vacuum gauge to the power boosters and saw that I was at 22 in of mercury. And then I sprayed wd40 over vac lines, and did not find any engine conditions changing. Hooked up the fuel gauge to fuel rail, and found that I had 39psi to the fuel rail at key on engine off. And Then hooked up the t-gauge to where the fuel flitter was, and found that I had 30psi to it.

Why is my truck idling rough after I have changed the spark plugs and the altenator

I have a 96 chevy s10 truck with the 262 4.3 vortec engine. I had it put in the shop for a burnt valve on the number 1 clinder and lifters knocking on the #2 and #6 cylinder, so I had the heads reworked on it. Now the engine runs fine at idel but when you get the rpm's up to about three grand the #6 lifters start knockin and the engine sounds like it wants to quit the whole time unless it's at an idel. It has no power at all and it will not climb a hill period. And my quetion is what do you think is wrong with this engine.

I just bought the truck for 400 dollars, it was missing on cylinder 4 so the person that I bought it from said. I went and changed out the plugs and wires along with the coil that was not already changed. The missing is not there any longer. When I take off it bogs way down unless I give it pretty much all the pedal. Is this because of a compression problem or is it a simple fix

I've had the truck for about 7 months. Rough idle since I got it. Found several vacuum leaks and fixed them. Replace the EGR, plugs, wires, cap, rotor and MAP sensor. Cleaned the TBI and replaced all gaskets and pressure regulator diaphragm and spring. Replaced the PCV and have blown out all vacuum ports and lines with carb cleaners and have not found any blockage. Lately, the truck has gotten worse and will hardly idle until it warms up and now, there is no power during acceleration until fully warmed up. Works better when I manually shift thru the gears allowing the engine to get higher RPM's. When on the highway, it would get up to speed but seems to take more time than at first. It doesn't have any power to pass other traffic on inclines in the mountains.
During idle, running very rich and can smell fuel.
Any ideas?
Jarrell

Hello, I have a 1993 chevy S10 blazer with 102,000 miles that idles very rough at a stand still, but under power runs okay. I have replaced the fuel injectors, replaced the oxygen sensor, cleaned the egr, cleaned the throttle body, cleaned the plantum, cleaned the idle air control (that was very dirty), checked the charcol canister for fuel in it, it was okay, check spark plug wires for arching they were fine, put blazer on a scanner and came up with a rich fuel code which was a 44. No engine light or codes other than rich fuel. You can also smell a strong fuel smell especially when you first start the blazer then it seems to clear up. Im stumped. Would greatly appritiate your advice on what you think could be the problem

Hi, Im not able to get the fuel pressure readings the guy who has the tester is in the hospital. Could the problem be the cataltic converter. It has a very strong fuel odor, I did have replace all the fuel injectors if that helps.

My truck has been idleing rough for about a month now. It has gotten progressivly worse. It used to run rough only when the a/c was on but we replaced the idle control and the problem was solved for about 4 months. Here's the first problem- now it runs very rough when I am stopped or with no foot on the gas at idle speed. Almost stalls when you come to an adrupt stop. When you do a steady speed the truck runs perfect. Second problem is if the a/c is on, still runs rough but the a/c will quit blowing completly when you try to pass someone or stomp the gas, then resume cold when you let off or maintain speed. To let you know something else-the truck has ALWAYS had blue smoke on start up. The temp gauge reads even and no problem lights come on, no other signs or symptoms that I can make you aware of. The truck runs the same rain or shine, hot or cold weather.