BMW Repair: Stalling E38 730d with M57 engine 2000 mod, crank sensor, diesel pump

Question
Hi
I have a E38 2000 mod 730 (diesel) that gives me quite a headache.
My problems started 6 months ago, when i was driving through Sweden (on vacation).
In a road "bump" the splashboard underneath the oil pan cam loose, and scraped along the road whilst driving - I had to drive for some miles this way, since there was no place to get underneath the car to unscrew it...
But after a while the car stopped completely, and i couldn't start it again.
After being towed to a brand workshop in Norway (a loooong way) they concluded that my inline diesel pump was broken and had to be replaced. So they did, and i could keep on driving... well i though so...
After approximately 10 kilometers away from the workshop, the car stopped again, no warning in the display - no service lights - it just stopped ??.
I turned off the ignition and tried to start it again - an it started kept on driving engine feeling just fine and so on..and it stops again, and again... and again.. it only happens between 3200 and 4000 rpm.
I of course contacted my local BMW dealer/workshop where they started diagnosing the car... 6 months ago.. and they are still going - they must have changed every sensor in the engine compartment (commonrail system) the main computer, engine electrical harness, crank sensor and much more...

The engine still stalls with no warning to this day, i will soon give up, and put the car on fire or something -
I have talked to my rep at the workshop, and they claim that this problem has NEVER been recorded on any BMW of this year and model EVER nor in Norway where i live or in any other European country for that matter.... even Germany... ?

The latest tip i got was to check the ignition cylinder electrical connections, or the DME relay..

I beg you folks... is there anyone who have had any kind of similar problem, or knows of possible causes... PLEASE give me some help.... :)

Torben


Answer
Torben, Did you make sure that the battery terminals are tight and clean. Have you tried the Mass Air flow sensor? The ignition switch is a good thought, it is pretty cheap. Haven't found this to be a common problem on my end.
Sorry about your luck.
-Evan