1999 Ford Windstar 6 cylinders code p0304

Question

I did a lot of repair to get rid of engine light on ( code P0304 ) but still lights on.
I changed the 6 spark plugs and wires, and also the fuel injector. I don't know what's next
to fix.

thanks
Arsenio

Answer 1

How was the sparkplug condition of the mifire cylinder ? this would give a good indication of what is happening. wet sparkplug would be a good indication of a mechanical condition, for now recheck the firing order.