Is the check engine light on? It is possible the the idle air control (IAC) valve may be inoperational. This motor located on the throttle body allows air to bypass the throttle plate upon start up and when coming to a stop. If not working properly it may cause vehicle to stall.
The rool back is down to slack in the drive line,
ie prop and back lash in the diff, there will also be some back lash in the gear box as well, this is completly normal so dont worry about it,, however you should all ways keep the foot drake on till you have put the habd brake on then and only them slip it into park as if you keep letting it rool back and stoping in park you could snap of the park claw inside the auto gear box, that a pricy repair, so please hold the brakes on before you go into park,,,
as for the stalling part,,, how fast is the tick over when warm and in gear (in drive with foot brake on)
if its less that 850 rpm thats the problem,,, auto's realy dont like a slow tick over, there is a lot of drag on an auto box, at tick over it should hold your car from rolling back on a slight hill or even drive up it with out you putting any power on to make it pull away, they also creep forwards in gear by them selfs, thats normal too,,safe,happy driving!!!!!!!
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