MAPed Blue Top Swap, NOT staying running! Please Help?!

[Nanaki]

Okay.. This is completly melted my brain trying to figure this out.. I have a AE86 GTS and the Motor was toast so I pulled the USDM motor/Tranny/Engine harness/ECU, and all.. Now I got a Japanese blue top MAP sensored motor & T50 Tranny /harness/ecu/ Gauge cluster the whole nine yards. Now.. After replacing the Dizzy and having to buy a igniter, We got it to start up and Idle but after idleing for about 20 - 30 secs it dies. instantly dies if you press the gas pedal... My thoughts is its not getting the right voltage to the 4 main injectors and its only running off the cold start injector till the primer fuel runs out?.. Is there some type of wiring I need to do? Im so confused..... Can anyone help me out please???

Also take note that I have noticed there is a black sqaure like plug that sits on the fire wall in the engine bay. One half of the plug is connected to the engine harness the other half looks like it goes into the fire wall and splits into the drivers side finder ( LHD )

Now.. on that plug on the Japanese engine harness side there is a Yellow ( Main injector power wire?? ) in the center the USDM side of the plug has nothing there.. I did jump the yellow wire to the black with orange on the engine harness side and it seems to get it to idle as stated before. Other wise it wont really idle at all.. Not sure if this is how that is supposed to be hooked up. I also tapped in the Black with Red wire that looked to have been cut on the engine harness ( Around where the igniter plug is ) it has one wire and a small black plug. I tapped that into the black with orange so that it gets power when the key is put into the On position.. If any other info is needed let me know. Im just so confussed as to why its not working........ Im soooooo Confused!!