Maybe if everything was already set up just to plug in and play.

Potentially many things to go wrong and it's hard to say where to start. Assuming you do have a decent map for your engine then not running an ISC valve will cause problems straight off unless you've opened up the throttle plate to let some air in. Have you got the map sensor plumbed in? And is the EDIS wired up properly too (or are you on a distributor?).