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Re: 91 Caprice running rough
there is a gizmo that bumps the idle speed up when you turn on the a/c or put the car into gear to keep the thing from stalling out due to the increased load. i cant remember its name, but i would start there. it is a solenoid connected to the throttle in the engine. it extends to bump up the idle speed by pressing the throttle open a tiny bit. describe it to someone and they will kno what im talking about.
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