P300 code misfire

Tred26

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So i have a 2014 GMC 1500 SLT with the 5.3l. I have replaced the plugs and wires and started to have a misfire on 1,3,7 cylinders. I am going to change out ignition coils unless someone else might have a better suggestion on which route to take? If i do replace them what brand should i go back with. Acdelcos are hard to find right now.
 

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