Quote Originally Posted by rspears View Post
I would check the TPS (throttle position sensor). Sounds to me like the ECU could be out of synch with throttle demand.
We had an 84 Town Car, same engine, same problem. Had it back to Lincoln dealer bunch of times and they couldn't fix it. Finally found a little garage where the guy knew Fords. Kept the car for a few days and drove it home so he could see what was going on. He replaced the throttle position sensor and it ran like a clock. Roger may be right about what you have going on.

Don