Highter Than Nornal Idle Due to Vacuum Leakon 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)
EnginesAffected: = affected_variants_list(car_problem_description)
5 Years Affected: 1996, 1997, 1998, 1999, 2000
6 people reported this problem
1 person shared problem details
1998 GMC 3500 Pickup- 5.7L V848,860
When you start the truck, the idle goes high, and when I put in drive, it comes to normal!! What that could be?
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