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I have an '03 955i that has the same problem....it ran rich from the day I got it....then I put an exhaust can on it and it got worse....I pulled the plugs a couple weeks ago and cleaned all the carbon off them; I have a tuneboy but none of the tunes offered seem to help much..I was thinking of trying to run a hotter plug in it...but I'm not sure...hella hard starts!!
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