Misfire keeps returning
 

I have a 07 chevy 1500 with a v8 4.8 lt engine...got a misfire on #3 & #4 cyl. Replaced all plugs all wires nd replaced #3 & #4 coils...ran truck. Misfire came back on same cyl. When truck got hot. So i replaced all injectors. Same problem returned. Wut else could be the cause ?

Are you saying that it's on the third and forth cly's on the same bank or across from each other?

across from each other.