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The Throttle Body of GMC Canyon vehicles is responsible for the regulation of air supply to the engine with the assistance of a butterfly valve that is regulated by the accelerator Pedal. Some cars may still have Throttle Body Injection, or TBI parts, but most cars today use multi-port fuel injection. Throttle Position Sensors (TPS) and Idle Air Control (IAC) actuators aid in controlling the amount of fuel supplied to the engine and the engine idle speed. Electronic throttle control has become prevalent in cars and killed the mechanical link and buffer because of their reliability and ability to interface with other systems. Throttle bodies may become dirty and old and so may need cleaning or replacement; other parts such as ETC motor and TPS sensor are however, replaceable.