SOURCE: high engine rev low
I would suggest an automatic transmission flush before I did anything else.
SOURCE: lack of power
it can also be an oxygen sensor for your fuel, i had the same issue with my malibu at one time.
SOURCE: engine doen't stay idle at steady rpms rev up and down by itself
Either you have a vacuum leak, a bad throttle body position sensor, or a bad throttle body.
If the throttle body is drive by wire (electronic) then it would be a bad throttle body.
If the throttle body is drive by cable (manually driven by a cable connected to the gas peddle) then it would be a bad throttle position sensor.
If the throttle body is bad the check engine light wil lbe on. If it is on have your codes read at your local parts dealer for free, and this will give you a clue as to which pices/parts you need to replace.
Have the car leak tested and the vacuum linse inspected for leaks as well.
SOURCE: My 1996 camry engine revs to about 2K rpm when
have your IAC valve checked, this is located at the throttle body, Possibly dirty and may be sticking. Replace if necessary!! Hopefully this helps!!
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