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As the name implies the throttle position sensor tells the engine computer where the throttle blade is. As you depress the throttle the throttle position sensor tells the engine computer that you are accelerating and coupled with other sensors how much fuel to deliver thru the fuel injectors. If you let off the accelerator the throttle position sensor tells the engine computer to return to idle speed, and the engine computer reduces fuel flow accordingly.
Without the throttle position sensor the engine computer will figure it out via other sensors but response will be slower. When you let your foot off of the accelerator it may not return to idle as quickly or idle may be rough as the engine computer tries to figure out how much fuel to deliver.
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