I don't see where you said you had it scanned for trans codes. I would get this done and see what comes back. If the engine is running correctly then it sounds like you may have a trans issue, as when you say it almost wants to stall when coming to a stop makes me think there is an issue w/ the toeque converter not unlocking.

And no, a trans. code will NOT show up as a CEL on your dash. You will need to find a trans. shop for this one as a normal Autozone scanner won't read these codes.