computer cycle, bad idle.....

[tharussian45]

ok, so when i turn my car on, i have a nice smooth idle for a couple minutes, but then it goes into a misfire. i'm not sure if its a cylinder problem or not. i do have a safc, 18g, 550cc's, and 272 cams on both sides. the car runs good for a couple minutes, then just starts to misfire kinda bad. anyone had this before?

 

[blackbyrd]

A lot of people have.
Do you have a logger, can you get us a log?
Are you throwing any CELs?
When do you specificaly notice this misfire?