3500 Pickup

Highter Than Nornal Idle Due to Vacuum Leak on GMC 3500 Pickup

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 48,860 (48,860–48,860)
Engines affected: 5.7L V8, Gasoline
11 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000
12 people reported this problem
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When you start the truck, the idle goes high, and when I put in drive, it comes to normal!!
What that could be?