A stepper motor is controlled by the onboard computer. The computer moves the pantile 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 needs of the automotive industry in 1946. Today Walker is one of the largest, privately owned manufacturers of fuel system components and engine sensors, and has served the needs of the worldwide automotive aftermarket. We are committed to supplying products manufactured to meet or exceed OEM standards and specifications. This effort is backed by our own manufacturing, product management and engineering staff to ensure it is maintained and accurate in the production of quality parts, vehicle applications, instruction sheets and technical support. 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. As an ISO 9001:2015/TS16949 certified company, we are committed to supplying the highest quality products. Vehicle Fitment: Cadillac Escalade 2000-1999, Chevrolet Astro 2005-1996, Blazer 2005-1996, C1500 1999-1996, C1500 Suburban 1999-1996, C2500 2000-1996, C2500 Suburban 1999-1996, C3500 2000-1996, Express 1500 2007-1996, Express 2500 2005-1996, Express 3500 2002-1996, K1500 1999-1996, K1500 Suburban 1999-1996, K2500 2000-1996, K2500 Suburban 1999-1996, K3500 2000-1996, P30 1999-1996, S10 2004-1996, Senora 2000, Silverado 1500 2007-1999, Silverado 1500 Classic 2007, Tahoe 2000-1996, GMC C1500 1999-1996, C1500 Suburban 1999-1996, C2500 2000-1996, C2500 Suburban 1999-1996, C3500 2000-1996, Jimmy 2001-1996, K1500 1999-1996, K1500 Suburban 1999-1996, K2500 2000-1996, K2500 Suburban 1999-1996, K3500 2000-1996, P3500 1999-1996, Safari 2005-1996, Savana 1500 2007-1996, Savana 2500 2005-1996, Savana 3500 2002-1996, Sierra 1500 2007-1999, Sierra 1500 Classic 2007, Sonoma 2004-1996, Yukon 2000-1996, Isuzu Hombre 2000-1997, Oldsmobile Bravada 2001-1996