Park/Neutral Position (PNP) Switch
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, and 1995 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The PNP monitors in-gear conditions and sends signal to PCM. This signal affects air/fuel ratio, idle speed and ignition timing.