If you buy a used engine with a damaged or malfunctioning Throttle Positioning Sensor(TPS), then you’ll need to replace this before starting your engine to make sure it will run properly. The throttle positioning sensor sends real time throttle position to the ECU which in turn adjusts the flow of fuel through the injectors to make sure you getting your proper fuel mixture to run your engine properly.
Click Here for a link to a Do It Yourself that was posted on D-Series.org on how to swap out your TPS on your throttle body.
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Throttle Positioning Sensor(TPS)is one of many car features,may affect the car performance and fuel economy