Don't adjust the little black box, its an electronic fuel pressure regulator and basically adjusts mixture. A small adjustment of the screw is a big adjustment in fuel pressure.

The black ecu controls the black box. The fact that its unplugged might be saying something lol. I would plug it back in and see what happens... if nothing then it may have been unplugged for a reason, so swap it and try again.

With the pressure regulator unplugged the metering unit should be set up to make a warm engine run, obviously a stone cold engine is going to be a pig to get going.

Good luck!

PS, you might be better off just starting one thread rather than lots. They are all covering pretty much the same topic, I find you will get more people answering/helping this way