Exhaust gas recirculation valve malfunction
A malfunction in the EGR valve can prevent exhaust gases from recirculating into the intake manifold properly. If the valve is stuck open, the gases will continuously recirculate, mixing with the fuel/air mixture. If the valve is stuck closed, the exhaust gases will not mix.
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Engine Stalls While Idling
The EGR valve is designed to mix small amounts of the exhaust gases based on the incoming air. During engine idle, the air flow is diminished, and the valve remains closed. If the EGR valve is stuck open, the exhaust gases will enter the intake manifold and alter the fuel/air mixture. This will reduce the engine power and can lead to a stall.