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just to confirm, there was only the miss in the one single cylinder? no other codes?
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okay, then if the plugs are new the coil is almost certainly the issue
you can replace just the one, you won't likely see a noticable/feelable improvement from doing all of them, but it certainly won't hurt
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
Best wishes to you with your repair.
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thank you in advance.