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running rich S40-V40

MY S40 is running rich,plugs carboned up)Scanner shows no codes.Idle is ok except if ac is turned on.Then idle drops to 400rpm.Idle doesn't drop if in gear(auto trans).Can't hear an ignition miss.Anyone have a suggestion on what to check before I take it in?
Thanks for any help
Dennis








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    Two things, clean the throttle body and check for vacuum leaks. Your 2001 is due for vacuum line elbow checks. The injectors will run rich if there is unmetered air entering the intake manifold or the thermostat is broken.
    --
    My name is Klaus and I am a V♂lv♂holic



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