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Old 01-09-2013, 01:39 AM   #18
peytonracer4
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Join Date: Jan 2010
Location: Valparaiso, IN
Posts: 6,487
My Ride: '00 328i
A vacuum leak will cause a high/erratic idle and also create a whistle/whine/purr noise.
It sounds like this is your problem. Sometimes they can be hard to diagnose without a professional smoke test.
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