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Old post, same problem
So....after reading 17 pages of possible solutions I can say I've nothing to add and still have this problem (rough idle at start with occasional stall at warm stops). It first occurred in 2017 at 50K, I'm around 100K now. At 70K (January 2018) I did plugs, coils, valve cleaning, PCV replacement, idle throttle adjustment, valve cover replacement and every damned thing else the dealer could think of for 4.5K. Maintenance is regular and with BMW spec materials, no cutting corners. 40K of highway driving later (700 m weekly commute)it has returned. Ugh! My love affair with the car is ending......
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