Gday, not sure if this has been discussed before, but having an idle issue with one of our evos. It idles fine until thermo fan comes on. Then it revs up and down until fan turns off. Also if you put the aircon on it stops reving up/down and idles smooth. I have changed the complete throttle boddy and stepper motor and still same issue. Also, since this has happened. when its idling normal and you turn lights on, it gives itself a little rev? Have cleaned all piping including all vacuum lines and plenum. Dont know wher to look next.

Cheers Mitch