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Idle Problem 900 1993

I am trying to solve an idle problem on my 1993 940 turbo wagon. I have cleaned the throttle body, checked the throttle position switch, changed the idle air control valve etc... This is the sympton. It idles fine with all acessories off, but once the electric fan, ac, or hit the power window button, the idle drops (450 rpms or so) and recovers (750 rpms or so). I checked the altenator and battery. Both checked out good. Does anyone know where are the grounding points? Maybe i can clean them and change out the wiring? I have the bosch fuel injection system.
thanks for your help.






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