A stepper motor is controlled by the onboard computer. The computer moves the pintle in and out of an opening that bypasses the throttle blade. This 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. Replace when trouble codes indicate failure. Walker Products began supplying the fuel system and engine management needs of the automotive industry since 1946. Today, As an ISO 9001: 2015/TS16949 certified company, We are committed to supplying products manufactured to meet or exceed OEM standards and specifications. Our products include Carburetor and Fuel Injection Repair Kits, Oxygen Sensors and other Engine Management products such as Throttle Position Sensors, Cam and Crankshaft Sensors, Fuel Injectors, Spark Plug Wires and Gaskets. Vehicle Fitment: Buick Century 2005-1997, Regal 1996-1995, Rendezvous 2005-2002, Skylark 1998-1995, Chevrolet Beretta 1996-1995, Camaro 1995, Corsica 1996-1995, Corvette 1995, Impala 2005-2000, Lumina 2001-1995, Lumina APV 1996, Malibu 2003-1997, Monte Carlo 2005-1995, Venture 2005-1997, Oldsmobile Achieva 1998-1995, Alero 2004-1999, Cutlass 1999-1997, Cutlass Supreme 1997-1995, Silhouette 2004-1996, Pontiac Aztek 2005-2001, Firebird 1995, Grand Am 2005-1995, Grand Prix 2003-1995, Montana 2005-1999, Trans Sport 1998-1996