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Constant communication between the ECU and throttle position sensor is required to maintain an ideal balance between fuel efficiency and power output. The throttle position sensor on your GMC V3500 detects the opening and closing of the butterfly plates inside the throttle body and the engine control unit determines the appropriate response. At wide open throttle it may downshift and flood the fuel injectors for more power, or reduce fuel consumption when you let off the accelerator. Either way, the GMC V3500 throttle position sensor is absolutely critical to your engine performance.
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