so here is an update, in the spirit of black humor its is somewhat funny.

I order all the parts, specifying that I want MB OE hoses.
Parts come in, I don't have the time to do the repair until Saturday
Everything comes apart easily and the whole job reveals itself to be rather simple and easy.
Turns out the idle control to take hose is not MB but CRP brand or some similar 3 letter name. I find out Saturday afternoon while scanning the forums that this particular brand is prone to cracking sooner than later. So in a delima I decide to wait until Monday morning to see if the local MB dealer has it in stock, which it has to be Monday as I am going on Family vacation to Washinton DC on Tuesday at 5 am.
No go on the part Monday so I use the hose I have with the idea that I will replace the hose later.
I replace the throttle body gasket, pressure regulator, distributor intake boot, all Idle control hoses and put it all back together .
After reassembly, it ran significantly better, it had one hick up on its first test drive but other than that it was way better.
On the way to D.C. it had one hard start after refueling but ran good the rest of the way. On our second day there, on our way into the city in a large traffic jam next to the Jefferson memorial it started running rough, stalled, and wouldn't restart. Awesome!
We pushed it over into the break down lane, unplugged the EHA valve and it started right up. wound up having to finish the rest of the trip with the valve unplugged.
I just ordered the control to manifold hose and will tear everything down again next week to see if that was the problem.