Frontier running ruff

[DaHigh1]

Sup guyz I'm trying to figure this out, car check engine light came on so I did the code reader and it said PO305 #5 cylinder miss firing. Started with changing all spark plugs and found oil in #3 and #6. So got new valve covers replaced that, all spark plugs and also #5 ignition coil also did #6 ignition coil cause the boot it self had play in it. Started truck and still running ruff put code reader on again and it still gives me PO305 don't know where to go from there