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I wish I would have exact answer for you but I had same code p0306 and First I changed all spark Plug did not fix the problem. Then changed all front three coil and still did not fix the problem. Finally I ended up changing 3 coils on Firewall and it fixed the problem. In short I do not have exact cylinder number to tell you which one you should change spark Plug and coil but if you have not changed spark plug and coil recently i would recommend you change all and it should fix your problem. I bought coils for $20 each from ebay and NGK spark plug from local store. Since Firewall side required to remove manifold, it is good idea to change both at the same time.
This manual link may help you