Car Shut Down When Accelerating. How Fix throttle Complete discription. If you're experiencing problems with your TP (Throttle Position) sensor in your car, it can lead to various issues with the engine's performance. The TP sensor is responsible for monitoring the position of the throttle valve and providing feedback to the engine control unit (ECU). Here are a few potential problems you might encounter if the TP sensor is not working properly: 1.Poor Acceleration: A faulty TP sensor can cause