BMGz33

So I recently got a p0300 random misfire code and I've already done the following:

-Changed (new) 6 ngk spark plugs
-Changed (new) 6 ignition coils
-New Throttle body
-New Valve cover with new PCV valve


I have check for vacuum leaks and everything is fine. The car idles really rough and it wont stay on if I dont steadily hold the gas pedal down a little to keep it from dying. There's definitely a misfire since I get a bunch of popping and violent shaking.

I also get a bit of dark black smoke when I rev it up to 5-6k which indicates unburned fuel.

All 6 plugs are completely black at the tip and still look new at the threads but they are wet, which I assume is from unburned fuel



I would think the Z1 motorsports Fuel Injector sub harness might be the fix, any ideas of what else it could possibly be?

iideadeyeii

iTrader: (6)

Injector stuck open?

Why not diagnose it properly instead of throwing parts at it?

I haven't tried it, but I'm pretty sure it would run on 5 cylinders without it stalling.