Defective Idle Air Control Valve
A defective idle air control valve may not open when the engine needs more air to avoid stalling. With a defective IAC valve, the engine may stall under heavier loads.
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Engine Stalls While Idling
The IAC valve is used to maintain idle speed. If the valve is faulty, the engine may stall while idling or when a greater load is put on the engine such as air conditioning.