92 4WD

1992 GMC Truck • V8 4WD Automatic •

I have a 1992 gmc 4wd with a 5.0 eng my problem is hard to start and it surges high an low when idling an when going down the road. I changed the throttle position sensor with no change any idear what it could be
June 5, 2011.

Check the fuel pressure with a gauge if its within specs-could be low, also clean out the idle air control valve and test the coolant temperature sensor-

Jun 5, 2011.