Throttle position sensors measures throttle position through changing voltage and sends this information to the onboard computer. The computer uses this and other inputs to calculate the correct amount of fuel delivered. Symptoms of failure include poor starting, improper automatic transmission converter lockup, engine stumbling, stalling, and or a check engine light. There is no scheduled service for TPS sensors. Sensors are non-serviceable and must be replaced when failure occurs. 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: 2008/TS16949 certified company, we are committed to supplying the highest quality products. Vehicle Fitment: 1987-2008 Isuzu Amigo, Chevrolet Astro, Chevrolet Aveo, Chevrolet Beretta, Chevrolet Blazer, Oldsmobile Bravada, Cadillac Brougham, Chevrolet C1500 Suburban, Chevrolet C1500, Chevrolet C2500 Suburban, Chevrolet C2500, Chevrolet C3500, Chevrolet Camaro, Chevrolet Caprice, Chevrolet Cavalier, Buick Century, Cadillac Commercial Chassis, Chevrolet Corsica, Oldsmobile Custom Cruiser, Oldsmobile Cutlass Ciera, Pontiac Firebird, Oldsmobile Firenza, Cadillac Fleetwood, Suzuki Forenza, GMC G10, GMC G1500, GMC G20, GMC G2500, GMC G30, GMC G3500, AM General Hummer, GMC Jimmy, Chevrolet K1500 Suburban, Chevrolet K1500, Chevrolet K2500 Suburban, Chevrolet K2500, Chevrolet K3500, Daewoo Lanos, Daewoo Leganza, Chevrolet LLV, Chevrolet Lumina APV, Chevrolet Lumina, Chevrolet Nubira, Chevrolet P30, GMC P3500, Datsun Pickup, Chevrolet R1500 Suburban, Chevrolet R2500 Suburban, Chevrolet R3500, Suzuki Reno, Buick Roadmaster, Isuzu Rodeo Sport, Isuzu Rodeo, Chevrolet S10 Blazer, Chevrolet S10, GMC S15 Jimmy, GMC Safari, Oldsmobile Silhouette, Buick Skyhawk, GMC Sonoma, Holden Sunbird, Pontiac Sunfire, Chevrolet Tahoe, Pontiac Trans Sport, Chevrolet V1500 Suburban, Chevrolet V2500 Suburban, Chevrolet V3500, GMC Yukon