I just mentioned this thread to the MB technician rebuilding my 119 motor (he drives a 500E too!). He feels that this stalling phenomenon is most likely a dirty throttle plate - as they become dirty over time, they adapt in order to let enough air into the engine. However, eventually they approach their adjustment limit, and in a hard turn (like a u-turn) there's simply no more adjustment that can be made to adapt to that situation.

The fix involves removing the MAF and cleaning the throttle plate. With that done, re-assemble everything and turn the car to the "on" position, but do NOT start it - wait 20-30 seconds until you hear some loud clicking sounds from under the hood (leave the hood raised during all of this) which indicates that the throttle plate's re-setting itself.

Please advise if this helps - good luck to all!

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo