I have the same car. Mine will misfire if the plug wires get wet. The last time I power washed the engine some water got down in the plug cavity. Dried things out and everything is fine. I would suspect the wires. The coil pack is probably fine, never heard of one going bad on one cylinder only. I suppose it is possible, but unlikely.
Since you have the exact same car. I was just wondering if you have had any problems with that electronic climate control unit not working or the dash cluster lights going out ?
Good luck