I would replace the sparkplug wires, and maybe check compression on the cylinders. The plugs will be wet if not firing. Here is a firing order diagram, worth checking. Sort of tricky to read, but the best one I've seen:
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I have in past had cylinder 2 misfiring from a carbon track on the plug, and bad running from

miswiring the plugs...
Good luck with getting the smooth running back again. Patience (and spare cash) help a lot!