2009 FX4 5.4L 180000km
Any help or advice would be great.
Check engine light is on. P0304 is the code that is showing up. Should I be looking at cylinder 4 for the problem or the 4th cylinder that fires for the problem?
If its the firing cylinder I should be checking 2nd cylinder correct?
Thanks in advance

 

It would be cylinder number 4, not the 4th in the firing order. I believe that means its the passenger side rear cylinder if you have a V8 or driver side front cylinder if you have a V6,

 

I've just dealt with that code. I have a 2013 F150 5.0. Code showed up because I had a plugged up converter. But, if I were you, I'd start with changing out the plugs and coils first. Or spend a couple of bucks and have a trained mechanic properly diagnose the code.

 

 

Thanks all for the help
Changed coil and plug seems to have solved the issue

 

Now for the other 7...