Wheres The TPS???

Anybody know where the TPS is on a 94 altima gxe?
Is it a valve or a spring or what exactly is it?
Any help is appreciated

TPS is Throttle Position Sensor. It is on the throttle shaft on the side of the throttlebody closest to the windshield. It changes resistance as the throttle moves. Since it is a moving part the contacts can wear most at the point where the throttle has moved most. The TPS must be adjusted correctly when it is installed. The top plug is for the engine and the lower one is used by the transmission computer if you have an automatic transmission.

http://www.rockauto.com/ref/BeckArnley/Detail.html?1580507.jpg

Thank you sooo much you've been such a big help
:-). I will try replacing that and see how it runs from there