When your 1979-93 Mustang's throttle position sensor starts acting up, your Foxbody might be hard to start or idle rough. Get a direct replacement plug and play sensor at LatemodelRestoration.com and get back on the road! Swapping to a bigger throttle body? You might need to replace the TPS also. These easy to install sensors from Motorcraft and BBK will get your motor running smoothly again while retaining factory plug ports.