VW 07 Golf - mark 4 -2.0 Manuel

[TLPHui]

3 days ago I started my car, after few seconds the warning light was on,
I scanned and trouble code showing P0302 (2 cylinder misfiring), I erased it but
after few seconds it came on again, that day was very humid here (Mississauga, Ontario).
The next day was much cooler and low humid, I started and
the engine light was gone. This morning once I started the engine light keep on blinking but after 5-6 mins the engine warm up and the light gone, at the begining, the engine has little bit vibration and some hesitation, after 70-75
kms running, everything was fine. I think that the humidity might be one of the reason.
Anyone who knows what is the real problem? Are the problems from the spark plug wires or ignition coils?
Thank you.