RepairPal is your advocate for car care advice and guidance

Q: 99 Yukon desn't want to decelerate most of time on 1999 GMC Yukon

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Have 99 Yukon 2wd 5.7 135,000 since new and most of time engine will not slow until I apply brakes. Idles correct, no service light or code. Years ago dealership replaced TPS and worked a couple days and returned. This also can happen if I pull say the MAF or other sensor wire, run then reconnect, it may decelerate properly for a day then back again. It comes and goes on its own. In a parking lot, engine will run 1500 or more RPM until I apply brakes then it idles properly. Will decelerate all the time by putting in a lower gear with higher RPMS - like vacuum has some affect. Driving it will take 3 blocks in D3 to slow from 40 MPH to maybe 30. Will decelerate when driving, if I shift to neutral and back to drive. Also has a 3 second lag period from releasing throttle to engine slowing.(maybe normal?)Thinking MAF or MAP?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
Didn't find what you were looking for?