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Sorry to post a year later, but did you get the misfire issue resolved. I have just purchased a E91 BMW 320i M sport and seem to be having a similar issue, cylinder 1, sometimes 3, misfire with the bank 2 code. Mine misfires whilst the engine is cold at around 3000 rpm. Once the engine is warmed up its sweet as a nut.
Did you have to replace all injectors?
It's really annoying to be constantly told how nice my car is (even by the garage) to then have to drive knowing I've got this problem!
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