Highter Than Nornal Idle Due to Vacuum Leak on GMC Suburban 2500

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: 149,000 (149,000–149,000)
Engines affected: 5.7L V8, 7.4L V8, Gasoline
8 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999
9 people reported this problem
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problem details
High idle when engine in drive/ not fixed yet