I don't think it has anything to do with the transmission. Take your car to your dealer and tell them of your concerns. I myself have kind of the same problem but without my ride stalling. The tac just dips every now and again when stopping which I think is nothing abnormal. I need a tune-up bad and plan to get the 30,000 mile, injectors cleaned again, engine purge again, and possibly my transmission and linkage done for other reasons. I'm sure some of this will go away, but I can't say for sure about your problem.
damn...my car has the exactly same problem!!!
i am still trying to figure out what the cause is
my car feels like it is going to stall when stopping after
driving for awhile...it idles at 300 or less i believe