2014 Mustang 5.0 CS. Only Mods are cold air and full exhaust to include headers. My Dad had the car for 100,000 miles with that set up no issues at all. I bought the car off my dad had for about 6 months now ran like a top. Wife was driving it the other day and it broke down. It was out of town so instead of limping home had it towed. Got home sounded like it was misfiring there was no codes at first or check engine light. Finally, check engine light got codes P0300-P0308 codes they changed...

Misfire help please