Been fighting it for about 7K miles .. vanos solenoids , front O2 sensors , TMAP and PCV-Vent tube didn't have any effect. I think its just the 130K mile turbos (injectors were replaced at 100K - FP at 105, plugs at 118K).. Oil use is about 1 qt in 1K miles. I think its just oil affecting fuel distribution and metering at light throttle openings (at least for me)
My thread -
http://www.e90post.com/forums/showthread.php?t=1369764