GMC Rally Wagon 1500 Problem Report
GMC Rally Wagon 1500 Highter Than Nornal Idle Due to Vacuum Leak
An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.
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.