3500 Pickup

Deposit Buildup on Throttle Body May Cause Low Engine Idle on GMC 3500 Pickup

Problem Description and Possible Solution

The engine idle may be lower than normal due to deposits built up on the throttle body, which can restrict air flow at idle. To low of an engine idle can result in a stalling condition. Performing a throttle body service will generally correct this concern.

Problem Data
RepairPal Verified
Average mileage: 88,600 (88,600–88,600)
Engines affected: 5.7L V8, 7.4L V8
5 model years affected: 1996, 1997, 1998, 1999, more2000
6 people reported this problem
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Severe carbon buildup. ChemTool spray cleaner did the trick.