Re: 06 tj 4.0 idel problem
Welcome to the garage.
Does the rpm drop a lot and does it stall?
With AC on, there will be more drag on the engine and the PCM should compensate for that with a bit more fuel. Maybe that the PCM doesnīt receive the AC on signal (not sure how this is arranged on the TJ, but would expect a hardwire signal from the AC panel)
What heat has to do with it i canīt explain. That shouldnīt influence the rpm at all.