2005 Dodge Durango Sputters and Stalls

This has happened within the past month or so. My truck whenever I stop/brake it sputters and sometimes stalls however the truck restarts with no problem after the stall. I took it to the dealership where I bought the truck (it is still under warranty) and they said it could be spark plugs or the throttle could be dirty (neither is covered under my warranty). I then took it to Auto Zone and the guy there told me to put it in neutral and see if the sputtering stops. He said if the sputtering did stop that it wasn't the spark plugs or the throttle. The sputtering did NOT stop when I did this. I am so confused as to what this could be and can't afford to be shelling out money to every Tom, Darrell and Harry out there who thinks they know what's wrong. No one can give me a definite answer. Help!!