I have a 91 mustang GT 5.0 with 175,000 miles. I cleaned up my throttle body on the inside. When I give the car more than 80% throttle the rpms will stay at 1000 in drive and 1300 in park. Then when I turn the car off and let it sit for a couple of hrs and then drive it the rpms will be fine as long as I dont exceed 80% throttle It has been like this for a couple of months I was just making sure I dont acclerate 2 much so the rpms wont be at 1000. The car idles ok 750 rpm but as soon as I give the car any gas it stays at 1000 rpm and wont go back down to 750. I have replaced the throttle bypass valve. Thank you for any help!
Sunday, September 30th, 2007 AT 1:41 AM