Hi,
I strongly recommend you to join the
www.audifans.com V8 mailing list. There a plenty of people from overseas (US) and the list is in English. You will get more response. But for now let's try to find the problem here
I could think for two things: Fuel pump (check the relais) and the vacuum pump for the door locks. I would recommend you to unplug fuse by fuse to find the culprit!
Regards
Bastian
