good sputter good

[Just me]

Hello. I've had this problem for a while and haven't solved it. Everytime I start my engine it runs great for about 2 minutes, then out of nowhere my idle will drop and I'll lose power. After about 30 seconds everything goes back to normal until I turn off and restart the engine again. If I give the car any throttle whats so ever during the 30 seconds of humiliation, it feels like I've droped cylinders. It's hard to diagnose this problem becuase it happens briefly. I've ruled out a few things like my fuel pump and mass air, EGR, AIB, MSD and TPS since they would show more consistent problems. I don't get a check engine light and when I took the car to the local dealership, the Ford computer showed the car is running rich when the problem arose. HHHHMMMMMMMMMMMM
HELP! What should I do? Where should I look?
Thanks