My '01 Mustang V6 revs high when in neutral/when changing gears.
The car revs to around 4,000 RPMS whenever put into neutral or when changing gears from 1st to 2nd, 2nd to 3rd, etc. If I put the car into neutral and brake to stop, the car revs until coming to a complete stop. I have changed the Throttle Position Sensor, checked throttle linkage, etc. but the problem persists.
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driving in over drive mode actually is what gives the economy as the engine rpms will be around 300 less than direct drive . Lower rpms = fuel savings
OD should come in around 60 klm/hr and drop out at around 50 klm/hr. When you are accelerating hold the pedal in a set position and watch the rev counter (rpms ) and each gear change you will see the rpms drop and then build back up as the vehicle speed increases At 100klm/hr the revs should be around 3200 rpms or less but if over ( say 3500 rpms) then may be the OD is not coming in. One way to test a box operation is to find a speed shop with a dynomometer and test the gear selections against loads and engine rpms
Define idles high like its going high rpms before shifting or the engine itself is high reving if its high rpming when shifting its mostly you tranny going out you can try tranny fix oil I used it on my truck when it had shifting problems and ive had no problems since it takes a few days to work though and if its the motor itself it could be a lot of things but I dont know much of the problem based on what you told us
Did you have the computer checked? Had similar problem with my 01 Grand Am. Computer was bad. Part cost $700 If you want to start small, change plugs, making sure they are gapped correctly, then wires.
IF the engine was revving high RPMS it had to be a serious vaccum leak. If the PCV came undone it would cause it rev up quite high. the shaking was from the factory set RPM limiter when not in gear (around 4,000 RPMS) the only other vaccum leak big enough would be for the brake booster. They both have a check valve but that doesn't mean much. I would start there PCV is around 5 bucks and the other is about the same. If you need pics of location I could do that also.