Questions & Answers for: GMC rough running

...is minor compared to how rough it idles at start up. Really smell the gas and exhust until it warms up if u have a damaged plug it can be running on 1 less cylinder ,it will idle very rough,change

Rough Idle on 1986 GMC Jimmy. Runs fun at speed and runs fine in park / neutral but idles rough at stop signs. Plugs are new, air filter is new, fuel filter is new. change your some sensors that can ...

2004 envoy 4.2 6cyl. runs rough. had a new 2004 envoy 4.2 6cyl. runs rough. had a new catalytic converter installed, new plugs a/c delco iridium plugs and rubber boots, still runs rough, coil pack? ...

running rough. I changed the spark plugs, checked the coil packs and replaced the fuel pumpand fuel filter. Still no change....Any suggestions? ROUGH IDLING CAN BE CAUSE BY MANY THINGS.I AM LOOKING AT

...runs rough, while running if the MAP sensor 1991 GMC 1500; V-8: Engine runs rough, while running if the MAP sensor is disconnected the engin shuts off. then map is working, have you tried tune

...severed off. It's running rough and blowing some blue smoke. It has not set any dash lights off. What are your suggestions? Thank YOU! change fuel filter- if still rough- check catalyic ...

...running rough at low idle For rough idle issues and problem troubleshooting,go through the help links provided below :-----van idles rough? ...

1995 gmc truck runs good then starts running rough when enginew warms up mainly when going up hills runs good when cool runs rough up hills then runs good going down hill check your fuel filter

...rough have you replaced the fuel filter. also check the battery new cars use a lot of power and that could cause a random misfire code. if those are all good then check for a vacumm leak. you can do ...

...4.3 v6 tbi runs fine in park wen at stop lights in drive it feels like its starving for fule running rough it also runs rough at 50 55 mph and im getting bad gas milage replace coil packs and tune ...