Highter Than Nornal Idle Due to Vacuum Leak on GMC 1500 Pickup

An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.

RepairPal Verified
Average mileage: 118,900 (17,800–220,000)
Engines affected: 5.0L V8, 5.7L V8, Gasoline
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
9 people reported this problem
1 person shared problem details
replaced intake gaskets and TBI gaskets, still has occasional high idle and stalls constantly.
Related Items:
a water leak prompted replacement of the intake gaskets which caused a crack in the manifold. r...
Also my truck backfires when I press on the pedal too hard, it bogs down, idles up and down...n...
I replaced the intake & exhaust gaskets, temp. Sensor, & sending unit. No change If anyone ca...
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases,...
Will not stay on after it starts have to keep pump the gas pedal

Related Content