My Jeep idles smooth as silk until the heat of ac is turned on then it bounces is this a sign of a bad pressure switch ? Please excuse my talking took this at 6am before my drive to work
Cleaning the throttle body changed nothingThrottle body is dirty
Did you do a computer reset?Cleaning the throttle body changed nothing
YeahI hear the vents blowing. Does the motor actually fluctuate like the tach? Does it do the same thing with the blower turned down to 1 or low?
If his pump is cycling that fast, it is probably a switch or electrical interruption.
So this is only a function of AC or does it do the same thing when the HVAC knob of out of the air conditioning position? If it's only on an AC pop your hood & see if the compressor clutch is cycling on & off with the fluctuating RPMs.