I have the very last North American 850ci (7/97). I get an idle surge at start, at stop lights. It's almost dangerous as the car can leap forward if you are not careful. No bad behaviors when driving. If I have the climate control off or the compressor disconnected electrically, no problems. A local shop has scanned the car and found a "compressor intervention" message. I know what you're thinking, I need a new ac compressor. But my feeling is that the belt would slip if I had such a stiff compressor. Before I change the compressor, can anyone think of anything else that could effect the idle at a stop or when starting the engine?


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