300xs spark plugs diagnose coil issue

[John2250]

Hey everyone so I have a few questions, I have a 2007 300xs, has all the updated coils in it they were replaced back in 2010, but the boat is forsure down on power it struggles to plain out on a 24p bravo 1, that being said compression is all good, all injectors we’re just cleaned and given a clean bill of health, I just swapped these plugs they have one trip maybe 2 hours on them tops take a look and see what you guys think, also let me say I think from looking at the plugs it needs 2-3 coils should I replace all 6 or can o just swap what I think is bad?