rpms jump while driving, 1999 ford mustang

Asked by Aug 13, 2016 at 02:07 PM about the 1999 Ford Mustang STD Coupe

Question type: Maintenance & Repair

while driving, the car well rev up to 3000 rpms then back down to normal

1 Answer

60

does this happen at a certain speed? or just completely randomly? if random i would look for a slight vacuum leak that tells the transmission to shift cause thats what it sounds like is happening.its trying to downshift while you are driving then realizing that the proper vacuum isnt there so it resumes current speed

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