Q: Erratic RPM when car is at operating temp 210-220
98 Jeep Cherokee. 4.0 liter. Automatic. When car gets to operating temp 210-220 RPM's start erratically jumping- mostly at idle, but will do it when taking off from a stop. Only does this after reaching operating temp. Replaced air idle control valve but problem continues. Any suggestions?
My car has 200000 miles.
My car has an automatic transmission.
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