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Diagnose and Fix IAC Valve Failures. Car and Truck RPMs Go Up and Down, Idle Problems, Shuts Off at Stops and Traffic Lights. How to Fix RPM's Go Up and Down Fault. How to Fix Car That Shuts Off at Stops. Car Has Unstable Idle Problems. Air Control Valve and Idle. Toyota 22re RPMs Go Up and Down. Honda Civic RPMs Go Up and Down. Symptoms of Car That Has Problem with Air Control Valve and Idle. Symptoms of Car That Has Problem with IAC Valve. Engine Shuts Off, Hard to Start. How to Fix Car That Is Hard to Start When Cold. Backyard Chevy is a participant in the Amazon Affiliates Program. You can support me further by purchasing using the link above. Thanks for all the support.