rotor spinner

Heres where Im at, ive got a 03' mustang gt the CES light came on so I pulled up the codes they showed cylinder misfires in #3 and #4(p303,p304) I changed the plugs, same codes, so I switched the #4 coil to the #5 cylinder cleared the codes came on again checked codes and got #3 and #5(p303.p305) figured problem solved replaced coils on #3 and #5 cleared codes drove around, light would blink for a few seconds then go off that happened twice, once after getting on it a few times, and one babying it. checked the codes came up p302 p304 cylinder misfires in #2 and #4 any ideas of whats going on?

MU71L4710N

probably several bad coils, i'd just replace all 8.