SR running on 1 cylinder

[simplemind7]

'93 240 hatch, S13 blacktop SR20, walbro 255, fmic, hks ssqv, otherwise stock engine.

i finally got my car on the road today and drove it around for a bit, everything was great, came home in it and parked it while i was eating some food, went out, started it up and was checking some fluids and cleaning the car up a bit. it was idling perfectly for about 10 minutes then it started running like crap and stalled, i hadn’t touched anything to do with the engine this whole time.

after unplugging coil packs i determined that it’s running on cylinder #4, the other 3 do nothing.

i’m not at my shop so i have pretty limited tools here and things take me a lot longer to do, hopefully someone has a good suggestion on what to look at first.

i tried disabling the fuel pump and cranking for a while to get all of the fuel out of the engine in case it flooded itself for some reason but after putting the fuel pump fuse back in it still only runs on #4.

any suggestions?

thanks in advance.

[simplemind7]

swapped coils around and it’s still firing on only #4, so it’s not coils.

forgot to mention, it is also running a Z32 ignitor.

[simplemind7]

i pulled the plugs, #4 was wet and smelled like gas, #1-3 were dry and did not, measured +12V at all injectors and coils though.

looked up info on pulling codes, and according to the info i got there should be a green/red wire used to trigger a red wire (CEL) beside it (pin 23 & 24, bottom-right of my thumb) but i do not have the red wire, just an empty hole.

and my ECU does not have the screw and LED like a KA and i believe some SRs do aswell.

it’s a nissan remanufactured ECU, could this have something to do with it?