[richtazz]

I would suspect a bad TPS(throttle position sensor) or iac (idle air control) valve, as the problem only happens when the car is warmed up. A tcc normally won't cause a part throttle blip at low speeds, it will cause a stall as you slow down due to the converter not unlocking as you need to downshift. Check a haynes or chiltons manual on how to pull the codes, and use the chart in the book to decipher them. My money is on the IAC valve or a TPS, but the egr is a possiblity also.