Car is an 84 733i. 125K miles. Car sat for about 4 years before I acquired it. I have replaced the following:
Fuel Pump (pre-pump was bad, replaced with an in-tank pump and eliminated the on-rail pump).
Fuel Filter
MAF unit
Coolant Temp Sensor
Plugs, plug wires
removed ICV to clean it, found a crack in the hose - so have new ICV hoses.
I currently have the cold start injector unplugged

Car will SOMETIMES start fine, run fine. Sometimes it starts like it is down multiple cylinders, when pulling the plugs they are black as coal.

So this morning, it started like it was down multiple cylinders. Cut it off, unplugged ICV, started and while running rough plugged the ICV back in and it ran fine...

On the way into work, the car died. It would not restart. I undid one battery terminal, waited a few seconds, and put it back on. It started back up and ran the rest of the way to work.

Any suggestions? This intermittent issue is driving me crazy!