1991 GMC Sierra "rough running" Questions

1998 gmc 454 hard starting and rough idle it turns over to long before starting and runs rough a little rich could it be timing Sounds like you might have a bad fuel pressure regulator.You can check ...

runs extremly rough at idle runs great at speed runs extremly rough at idle .runs great at speed or under load 1994 5.7l tbi Has new cam ,lifters ,distr, plugs and wires IDLE POSITION CENSOR IT IS ON ...

1998 GMC Sierra- runs rough then stalls when 1998 GMC Sierra with 5.7 vortec. runs rough then stalls when stepping on accelerator. Have put on new fuel pump, new fuel pressure regulator, new fuel pump

...not start 96 gmc vortec 305 will not start . truck has new pump ,plugs cap,rotor,wires but runs rough at idle also new fuel regulator .motor will not start now, and kicks back on starter. will

my sercive engine lite started flashing and my engine runs rough it seems to be ok at hiway speeds but at an idle it runs rough I have a 2000 gmc se 4x4 extended cab pickup about 140,000 miles Take ...

Rough accleration through 2nd gear Truck is 4 speed automatic. Truck acclerates rough through first and into second before smoothing out. Have replaced plugs, rotor, cap, fuel filter, pcv, exhaust ...

...running very rough. It idles rough and losses power under load. I changed spark plugs and wires along with fuel filter. We put it on the code scaner and showes no codes. The service engion light does ...

Runs rough till warmed up. Hesitates. I put a new Runs rough till warmed up. Hesitates. Surges. I put a new TPG on it, carb cleaner, new O2 sensor Ok, you got new 02 sensors, that is good, Now check ...

...running rough and now it gets a back fire when put into gear. I read codes says O2 sensor heater circuit malfunction (bank 2 sensor 1) Is this part of my problem? Yes bad o2 sensor,check for vacuum ...

rough at idle, runs fine driving, smells rich in exsaust Check for vacuum leaks n (broken or leaking hoses; gaskets), bad EGR valve (plugged or stuck open) or raw gas running into the intake manifold