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I would highly recommend replacing injectors. Had the same issue with my M6 GC Comp. 6 series apparently are notorious for having high pressure fuel pumps and injectors fail due to poorish design. BMW replaced mine under warranty after they (HPFP & injectors) failed around 95k miles. Apparently these issues occurred quite often that they extended warranty for up to 120k miles or 10 years; at least for S63TUs.
More than likely this will resolve your issue.
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