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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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I seem to trot this out every few months..
Have they looked at the throttle position indicator in the air flow sensor? Mine was fried at the fouth position and required a new air flow unit ($300). I had similar symptoms as you. My wrench said it would normally be quite difficult to diagnose if you didn't know where to look.
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Several BMWs
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