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have you checked compression?
well only a few things cause miss fire codes...ignition (plugs/coils) fuel injectors or internal motor issue....next step would be injectors if compression is good
yes it will
it is likley clogged injectors
not really any esy way to test other then swapping to another cylinder
well if compression is weak ya narrowed it down to internal failure....if its good then its pretty good odds a couple injectors will fix it