Close
Car Questions
RepairPal is your advocate for car care advice and guidance

99 Yukon desn't want to decelerate most of time

(1999 GMC Yukon)
in Fresno, CA on January 07, 2012
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?
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide. Learn more

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
rear access glass wont stay closed. I can open lift gate and then lock the glass but as soon as the gate is shut the ...
I have an 03 yukon. When went to start it this morning when it was pretty cold outside. It struggled to start due t...
Didn't find what you were looking for?