trying to find what side of engine is cylinder #7 on in a 6.0 GM ENGINE IN A ISUSU

Question

I PULLED THE PLUGS AND INSPECTED THIRD ONE BACK ON RIGTH SIDE WAS BLACK ALL OTHER PLUGS WHERE WHITE,I ALSO PUT A NODE LIGHT ON ALL OF THE INJECTOR CONNECTORS ALL CHECKED OK, SWAPED COIL AROUND STILL COME UP WITH CODE PO307,COULD PROPLEM BE BAD INJECTOR.

Answer 1

Can be injector with a bad spray pattern or compression