sr20de running rough low acceleration in 89 240

[delphis]

ok so I am having a problem with my sr20de(non turbo) I was driving home the last night and the engine had a loss of power wasn't over heating and oil level was fine. it seems like on the the cylinders isn't firing or maybe something wrong with the timing. it shutters very bad at start up and runs very rough and has very little acceleration power. sometimes even while coming to a stop the engine will just die on me. it is running on a ka24e ecu and a modded ka24e wiring harness. It definitely seems like only 3 cylinders are firing just because of the loss of power. There is no water in my oil so there isn't any head issues.

I added some injector cleaner and checked the timing and all of the plugs are still firing but I didn't to check the actual timing itself.

symptoms:has a rough time idling drops pretty low and I must rev on occasion to keep the engine from dying.takes a long time to accelerate up to normal speedtop speed on flat ground is just about 70-75mph while flooring it in 5th gear

[180fan]

check the injectors to see if they're actually firing. you can pull the plug on one at a time to see if it changes the idle.

If you're able to get the engine going and with all 4 injectors/plugs firing, check over your timing. Then post back results.