Walker Products 215-2004 Fuel Injection Idle Air Control Valve Controlled by the onboard computer The computer moves the pintle in and out of an opening that bypasses the throttle blade Allows the computer to precisely control idle speed when varying loads are placed on the engine Symptoms of failure include engine stalling, surging, poor idle conditions, and or a check engine light Check for proper operation with each tune-up and replace when trouble codes indicate failure