Basically your car isn't getting the right air/fuel/spark it wants. You need to back track to find out what it's not getting enough of (if at all), or getting too much of.
If the MAP is reading -1 psi, it's fairly close, but it's still better to get it running on a stock sensor first. Next turn on the key, then measure the resistance from the battery +12v to the injector clips - both sides since you've molested the wires. With the injector box in, it should read 6-8 ohms, with no injector box it will read 1ohm or less. You should also check resistance between the two wires in each injector clip. There should be no continuity between them.
As JD said, try starting it with starter fluid. Spray a shitload into the throttle body after disconnecting the injectors, then crank it over a few times. Make sure the plugs are dry like Das said, you can hit them with starter fluid or carb cleaner. It should at least sputter a little.
If it starts, ziptie the injectors to the rail, pull them out of the manifold, then crank it over with them plugged in. If they spray, it's a matter of too much or too little fuel. If not all spray, it's your wiring.