That sucks OP, I would see if you can borrow another tune to rule it out. Lots of people have had this issue and from what I can tell, plugs, coils, injectors, vanos, etc. nothing fixed it. Only way you can really get around it is with a Cobb AP turning misfire detection off.
If coils, injectors or vanos are the issue, consider yourself lucky. I don't think that's the issue though, especially if the car was running perfectly before RBs.
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E90 LCI N54 6AT
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