Is your 1979-93 Mustang hard to start or idling rough? Get replacement throttle position sensors today at 5.0 Resto. Your Foxbody's throttle position sensor (tps) tells the computer where your throttle blade is to calculate the proper parameters to keep your engine running efficiently. When these go out, you can experience starting, idling, and driving problems. Don't let the problem get worse, order your BBK or Motorcraft replacement today for your 1986, 1987, 1988, 1989, 1990, 1991, 1992, or 1993 Fox Body Mustang.