cylinder#4 missfire

What is your question?

wether getting cold and i starting to see the problam in the morning again, in cold wether only. The missfire only last for few seconds but it lives the check engine light.Which is #4 missfire. Every time its happening when you drive the car for one mile, its funny because every day morning after living home and when i get a same spote the car start missfire.it seems like missfire starts when the Temp.gauge start to come up and stop missfire when gauge reach at middle. my spark plugs are new and plug wires new,i swap the coil pack from my friends subaru, my timing belt done by delar year back. plug and wire are oem. thanks