Not that's something I don't want to hear
. My car (7AT) does the same thing when everything is cold. I will get an uprev from 3rd to 4th. It will still shift from 3rd to 4th, though. It only does until everything gets warm. After that I have zero issues.
I just got a new tune today for the tranny
and I can already tell the diffrence when it shifts. Now that might be another story when I drive it in the morning.
Do you get a clunking noise when you let the car down shift into 2nd? Mine doesn't do it all the time but it's the opposite. It only does it when the car is warm.