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Running at half power

I had a similar experience recently on my 735il.  Loss of power, the EML and 
ASC lights on, 15 faults on the Dignostic Information System (DIS).  It took 
the dealer 10 days to diagnose the problem, including trying replacement of 
 the EML module which had to be ordered from Germany.  Turns out the 
7-series has a 'fly by wire' throttle.  The EML module controls a stepper 
motor in the throttle body that positions the butterfly valve  to control 
the air flow based on all the engine/air/fuel/exhaust/temperature/load 
sensors.  When it fails, the car goes into failure mode and if it will run, 
it's just barely. (I ended up driving back from Lake Tahoe at 35 mph in the 
middle of the night praying the electrical system wouldn't go black on me in 
the middle of the canyon).  The motor is called the 'DK Motor' and you have 
two in a 12-cyl, one for each side.  They're about $750 each (Get a BMWCCA 
card and at least you'll save something off the list at the dealer).    What 
was interesting to me is that the DIS couldn't pinpoint the problem right 
away -- it took about six hours and several of the dealers technicians to 
get it diagnosed.  Thankfully, they only charged me for two hours.  You 
might have the mechanic check the DK motors and see if that's what's causing 
your problem.  Good luck.