'97 Gmc K1500 Misfire

[TravisT]

Hey all, i have another problem, my previous post was about a random misfire p0300 awhile back, i just forgot my username so i had to make another account. Well i fixed that random misfire, but when i went to adjust my valves on #4 cylinder to finish clearing the misfire issues i was having, more problems started. Now when i start my truck in the mornings and drive, it drives fine, no misfires or hesitations at all, but once it reaches operating temperatures everything goes to hell, number 4 cylinder starts misfiring real bad, like it isnt even firing at all, but like i said before it does fine when its cold, just when it gets warmed up it starts acting up, any ideas as to what could be causing it to do that only when its warm?