The last time I was out for a drive the Tbird kept slowing down until it was almost stopped. There was a wrench lit up on the dash. I pulled over, shut it of, restarted it. The wrench light was not on. I drove about 10 miles and the same thing happened. It drove fine in between. This time when I restarted it, the engine light on the dash came on and stayed on. I drove the 20 miles home. Parked it. Light was still on. I seem to remember it shifting a bit rough before the first incident but ran and shifted smooth otherwise.