This just started happening with my 1990 Grand Marquis EFI 5.0.
After I start driving from my home and stop at a light, sign, etc., the car starts idling very high with my foot on the brake. It changes on its own because when I leave home it is idling fine. Sometimes the idle doesn't change at all.
The most common time it happens is after I get on the highway and the car was idling fine until I got to the highway, I drive approx. 60 MPH for around 20 minutes and when I get off and come to my first stop the idle stays high then also.
Any ideas on how to elminiate this problem?
Thanks.