fuel injectors wont pulse!!

[countrytuner]

So ive got a 90 240 that i swapped a 93 ka24de into. I drove it for about 40,000 miles completely trouble free. Just the other day it started losing power terribly and it was only running on the #1, 3, and 4 cylinders. I checked spark and it has tons. I checked all the injectors and they all read correct resistance. I have 47 lbs of fuel pressure when i turn the key to on, and 45 when cranking. i checked continuity between the ecu pins and all 4 injector ground wires. I hooked the 12 volt injector wires directly up to 12v battery source with a new wire. It has a brand new coolant temperature sensor. i have tried 2 dizzys and 2 ecu's. The 2nd ecu i tried was supposed to be a good working computer, i plugged it in and it idled and ran fine for about 30 seconds, i took it out on the road and as soon as it hit 4,000 rpm it quit running and i havent been able to get it started since. So now i have 2 computers that do the same thing... Code 55 on both... im running out of ideas and options. Any ideas?????

Josh

[countrytuner]

Anyone?? im still at a loss :S

[countrytuner]

ok so i made a little headway. I found a bad ground from the ecu so i reattached it and now itll start if you floor it. It runs really rough so i checked and it is only running injector #2 with both ecus, i changed the distributor to one that i know works and then it started running on injectors 2 and 3... what would cause 2 of the injectors to not fire? al the injectors are fine cause if you switch the injector wires to the other injectors, then those injectors fire.

[Justinians_2:40]

You need to use the FSM and troubleshoot the wiring harness and make sure you don't have any shorts. I'm pretty sure the FSM documents this fairly well.

[countrytuner]

thanks ill definitely look into all the wiring