Hi Zak, you should keep your thread going on the other forum too, I added something then saw that you deleted it. There are some sharp W201 guys over there.
Wow, you've replaced quite a few expensive parts Zak. I hope the dealer can find the problem, if so, please post the resolution.
It would sure be a shame to have replaced all of those parts and find out that you have a bad ground connection!
I see that the EHA was replaced but I didn't see a Throttle Position Sensor on the parts list. Was is tested?
Dave