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The Throttle System regulates the amount of air entering the engine, indirectly controlling the fuel-air mixture needed for engine power. When you press your foot on the accelerator lightly, the throttle valve opens slightly to let in a small amount of air. Conversely, if you “floor it” and press down hard on the gas pedal, the throttle opens wide to let in more air, signaling to the car you want to go fast.