Where is the throttle position sensor on your 2004 pontiac grand prix gtp?

The TPS is located on the throttle body of the intake system. Follow the air cleaner duct until it clamps onto the throttle body (which is right after the air duct). If you pull off the air duct you should see the throttle plate which moves accordingly with the gas pedal. The TPS is mounted in line with the throttle plate on the side of the housing, usually black. Look for an electrical connector.