GMC Rally Wagon 2500 Problem Report

GMC Rally Wagon 2500 Highter Than Nornal Idle Due to Vacuum Leak

(6 reports)

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

Related Items:
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases,...
A coolant leak may develop from the water pump. This can result in an engine overheating condit...
An oil leak may develop from the distributor o-ring seal requiring replacement of the seal.
On the 4L80-E Transmission (Diesel and 7.4L gas engine), Transmission fluid may leak through th...
I actually have a 1984 GMC Rally STX, but I figure the vehicle and years are close enough. Wher...