Throttle Position Sensor. It lets the computer know how far the throttle is open.around. I corect me if i'm wrong but i think the computer sets closed throttle every time you start your car. As long as it's around .90-.99v it's fine.
Yeah my TPS at idle is 1.3 volts. AT WOT, it's at 6 volts. I was gonna mess with it, but I didn't feel like taking off the cruise control to get at the TPS screws. I'll mess with it when I get a tweecer