Hey guys, my 6.0 L started flashing the engine light at me the other day while towing my camper, again yesterday with the dump trailer on. I scanned it, it's showing PO300.

I have no idea where to even begin with this as it's very intermittent. It only seems to happen at high rmp. (2500 or higher)

Aside from a Volant intake the motor is completely stock.

Any thoughts or suggestions where I shold begin?

Thanks guys!

 

watch the misfire data to narrow down which cylinders to go after