If your vehicle stalls, the check engine light comes on, or it has trouble idling, the EGR valve may need cleaning. The EGR valve, or the Exhaust Gas Recirculation valve, pulls a small amount of exhaust so it recirculates into the engine to reduce emissions from nitrogen oxide.
However, this constant process often causes carbon build up, which interferes with operation. Clean the EGR valve by following these steps.
Prepare to Clean the EGR Valve