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Just dealt with this on my 2008 335. At least the rough idle issues....
Dealer replaced plugs, coil packs, injectors, updated software, DSC sensors, and cleaned the intake. The problem went away and the car idles great. 54k on the clock.
My only problem now is I'm getting a P30FF every time I get on it. Need to bring it back to the dealer and let them figure out what they did to give me my new-found boost leak.
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