Car Problem Reports

GMC Rally Wagon 2500 Idling Problems Due to Vacuum Leak in Throttle Body Gasket

GMC Rally Wagon 2500 Problem
6 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995

Engine Affected: Gasoline


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