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

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: 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
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
Viewing 1 - 1 of 1 problem details
1998 GMC 3500 Pickup - 5.7L V8 48,860 mi,
When you start the truck, the idle goes high, and when I put in drive, it comes to normal!! What that could be?