Our 2007 Ford Focus MK2 had a rough running engine - Error Code P0304 Cylinder 4 Misfire

On of the recent mornings the engine on our 2007 Ford Focus MK2 did start running very rough - I got myself a OBD2 dongle for diagnostics ( https://amzn.to/2GF9OhN affiliate Link) and with that I found out the error code: P0304 Cylinder 4 Misfire - also I noticed that when running in place the area behind the exhaust became wet with gasoline.

So it was pretty clear that it its a ignition problem and probably not cause by the injection system.

I exchanged the old Spark plugs but that didn´t fully resolve the problem.

in the end replacing the ignition coil resolved it. ( https://amzn.to/2SrWxfs affiliate link, check combability with your engine! Amazon has that option.)
I found one shop online which would have offered coil, spark plugs and igntion cables

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