First off I'm no guru, but here's a picture of my 2006 3.0d (bought in SA)relays, if its of any help. My relays are in different slots and I seem to have an extra relay in what would be position 6. I guess that the relays you have installed will vary depending upon the options installed, and you may have completely different stuff to me! However I would try match my config (bar position 6) and see if your electricals return. I do not believe you can cause any damage by plugging the relays into the wrong slot.
Don't know about the idling problem but if your diesel can idle at
5000 rpm it can't be all bad
