on my v-10 I had a litle miss, swapped coils from one cylinder to another, miss got worse, ended up bieng a few bad coils,
MODE 6 is your friend here for missfires, it will register there before you will get a p 300-308 code.
also check your fuel injector faults,
Ive had more than one that the clips broke on and had to zippie tie them in.