1998 Toyota 4Runner cylinder 2 misfire

The check engine light came on and I had the code checked the code came up as(misfire on cylinder 2 detected) I changed the spark plug and the spark plug wire and the problem still exist. I swapped ignition coils around and the problem came back again
This problem shows up after the engine has been running for about 10 minutes. When the engine is cold it runs perfect any help would be appreciated
thanks in advance