Wow!! Talk about the devil. . . you've got him and his army! Get a gun!
You have gotten some good info;
1) Pete's page is great for the pics of 'crumbled' wires inside of the ETA. I would agree "sight-unseen" that the ETA has got to go. But you need to check my page, MENU#24 for symptoms of a "V8" not a "V12". You will see the codes that were set in the various key modules. And some scenarios that match what's happening to you.
2) I'd check the FP regulator; it's mostly likely leaking badly. Do a search and you find some recent posts about the hard-starting, poor idling problem.
3) Not sure I take the injectors out until you do the FP reg. If still a problem, then have at them. But remember you need all new supporting gaskets, seals, etc. otherwise they will give you a lot of problems.
4) As far as the codes, you can use my page since they are identical b/c your car is an "LH" as is mine. Also you should have the built-in push button and switch (X11/21s1; MENU#2) combo so you can read codes from the Diag Module (Menu#6). But you will need to read the other modules. There's a neat schematic in MENU#2 at the bottom of the page. Build it and use it to read codes from the other key ECUs. Or better still, maybe your tech has a scan-tool that you can use to read codes complete with detailed MB explanations. That would be best, b/c I think that you may have a bad ECU as well. Remember when the wiring harness gets real 'bad', it usually causes damage to an ECU b/c of the shorting wires. If you can narrow it down, then possibly finding a 'sub' from a working car to check. You can buy "used" ECUs from the PartTrackers Network in the Links section of my page.
You've got the MOST problems that I've ever seen in one car!!! Lot's of good luck . .
