Why does my vehicle stall?

What is your question?

I have had this vehicle for only 3 months. It idled rough but has been fine up until a month ago. First battery went dead...replaced! Than all of a sudden it would stall when stopping. I pulled into parking lot to work and it started to die but didn't...it felt like it was losing power. Well I thought maybe the cables were not on tight enough, so had someone check, they were fine. Took it too Auto Zone they put on there machine and said all the sensors were good. I had the alternator checked said it was good, but it was still on the vehicle??? Had the wires and plugs replaced also. Can't really get an answer from anyone since I am a woman. Don't know if they don't know anything or don't care?! I thought maybe the fuel filter, but when I went to price it, they told me it don't have one???? What the heck!! Please HELP...this is so FRUSTRATING!