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Old 11-13-2012, 07:34 PM   #7
4ndyhuynh
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Join Date: May 2007
Location: San Diego, CA
Posts: 60
My Ride: 2001 BMW 325i
This could be the notorious idle problem with manual E46's. My car's idle used to go up and down while coasting, so I replaced a bunch of parts including Vanos seals, ICV, DISA valve, but in the end, a DME update fixed the problem.

If not, I would go to Oreilly or Autozone and have a battery/alternator test (free).
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