My 1988 TC at times (engine warm or cold) idles anywhere from 1500- 2000rpms. It can happen when I am driving or stopped. If I shut the car off and restart it comes back to a normal idle (approx 7000) Any Ideas? Thanks,kev.

That sounds exactly like what my 88 does when the ignition module is starting to go out. Seems to be a common problem. Make sure that you replace it with a ford part. I think that I have been through 4 or 5 of them now. We always used the local parts store brand until last time. Last time we changed it out, it took us over a year to figure out that it was not compatable with the TC computer. This specific one caused the car toseverly cut out as it was warming up Good luck