I would check out the crankcase breather/OSV as well. I recently had a similar on going issue with my 2006 X5 4.4i. I was (over)due for my Inspection 2 (I hit 100k miles a few months ago.)After performing inspection 2 my X continued to smoke during take-off after idling at the traffic light and the car almost stalling 60-90 seconds after start up still persisted. As a last ditch effort before i hauled it in to my Indy for diagnosis and repair. I ordered the crankcase breather repair kit online for about $36.00. It took about two minutes to replace the diaphragms and springs. Started the X and like magic my problem was solved. This may not be your issue but at 36 bucks and a total of 4 minutes of my time i believe its worth a shot. Below is a link where I purchased the parts. By the way, it's nice to see another member in GA on the forum.

BMW Crankcase Vent Valve Pressure Regulating Valve (2 Per Car) 11127547058 - RM European Auto Parts

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2006 4.4i Sport Black on Truffle Brown, Premium and Cold Weather, Navigation, Rear Entertainment System


GO DAWGS!!!