I have a '92 Dodge Ram250. About every ten to sixteen thousand miles the throttle position sensor goes out. The truck seems to go into a free wheel mode at fifty miles an hour. My dealer changes the throttle sensor and the truck works fine. The dealer can't tell me why the sensor keeps going out. I have changed it out the last four times myself. The part now cost over two hundred dollars. If anyone can give me any ideas I thankyou very much.