Wow, you problem is kinda awkard...

BUT FIRST........ WHAT KIND OF CAR DO YOU HAVE?!?!?!?!

usually stalling would occur AFTER the car has been put in DRIVE (D gear selection)

Does it do it when warm, cold, or both?

It seems to be something with the idle....

could be...

Vaccum leak
Over voltage protection relay (O.V.P. on this forum!)
Idle control valve

I GUESS one or more of these may be the problem....

Do a search in this forum,