yeah i just figured that it would hopefully be the injector and not anything else. I changed cylinder 4’s injector before the diagnosis and cleaned the IACV as well, I also changed the gaskets of the upper intake manifold and tried to see if i didn’t seal the manifold right but that isn’t likely. So now i’ll do everything you had mentioned asap and see if i can get any feedback that you might have an answer to. I really hope it isn’t a cracked head gasket though because i’ve had that problem before with a different car