Sensor-Throttle Position: Description
WARNING: This page is about a different car, the 2007 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The 3-wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade shaft.
The 5.7L V8 engine does not use a separate TPS on the throttle body. If it is determined that TPS signal is bad, due to the sensor itself, the throttle body will need to be replaced.