A misfire alarm typically means the coil pack mounted above the sparkplug indicated in the misfire had gone defective.
To test it, swap the coil pack with another cylinder, and see if the misfire goes from #2 to the cylinder you put it on.
If the misfire continues to be on #2, then consider changing the sparkplugs.
I hope this helps.
If you have changed spark plugs & coil pack(s) and still have a misfire at the #2 cylinder location then you should check the condition of the contacts (making good contact or might need cleaning) at the coil pack or if there is a crack in a wire in the harness that leads to Cylinder #2 coil pack, that's where I'd be looking for the problem.
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