Update for anyone looking for answers in the future. In this particular case, injector holder "O rings" have improved vacuum while driving, I ordered the wrong injector seals, so the old ones are back in at the moment. I suspect that new injector seals will solve the rest of the vacuum issue.

I also replaced what I call the throttle body boot. I doubt that had any real effect, so my advice to those that happen upon this thread, would be to do the injector seals and O rings first, as well as the IAC valve hoses.

I did search for the vacuum leak with ether, while having a multi meter hooked to the O2 sensor, My results did not show any change with ether, but it could have been errors on my part. Also guessing that some of the injectors are leaking down when the engine is shut off, as it sputters a bit upon a cold start. Replacing the injectors when the new injector seals arrive, and I expect the car to start and run well after.

__________________
'83 240D
'85 300D
'86 300SDL
'88 300E