Any DTC's ,something should show out of range if it's dumping fuel in the cylinders, unless you just have one injector failing , and the ecm doesn't see any change in coil resistance,but the injector is hanging up inside, and fuel is just blasting threw it. It would be nice if you get a specific cylinder miss code, to point you in the right direction. If you think it's all the cylinders running rich, check the fuel rail pressure regulator vacuum line, maybe it's cracked or leaking, that would cause higher fuel pressure at all engine loads.
