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Have you checked the IAC, etc? I would hate for you to buy a new TPS (expensive little buggers) just to find it didn't fix the problem. If it can be adjusted to 0.5V - AND - it's idling high, then it's not likely to be the TPS. As I understand it, TPS errors occur as you move through the throttle range and encounter bad resistive sections, thus fooling the ECU into thinking the throttle position is somewhere it isn't.
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