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.
Deposit Buildup on Throttle Body May Cause Low Engine Idle on GMC 3500 Pickup
Average mileage: 88,600 (88,600–88,600)
Engines affected: 5.7L V8, 7.4L V8
6 people reported this problem
Severe carbon buildup. ChemTool spray cleaner did the trick.