Hi i'm not here often, my stock evo8 is throwing codes P0204 and P0304 basically saying the #4 cylinder's injector isnt working.

I put some injector cleaner in the tank and its still misfiring. I'm going to take the fuel rail out and try to clean that injector out. Anything else I might try?

How do you clean an injector anyways? Just run it under water? lol...

 

you could try swapping injector #4 for injector #3 so you can isolate either the injector, the wiring, or the output from the ECU. just a thought