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A BMW master technician on another forum told me this when I pm'd the symptoms and the link to this thread:
I've never had that concern on a repair order. N55s are finicky little engines. Actually a down right pain in the ass to be honest. They are notorious for idle surges ECT.
I do not know a fix for it personally but I do know there are lots of action that can be taken with valvetronic faults in the car. Possibly an ecentric shaft, vtt motor harness and dme. All of those can cause that
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