why does my car die out while ideling?

check the pcv tube for vacuum leaks.

is the engine light on?

try doing this for now so it wont die on you everytime ur at the light... whenever u come to one of those stops put ur car in nuetral just to keep the rpm's up and whenever that light turns green or its ur turn to go put it back in drive and keep her going.. Just a little tip till u get ur car fixed all the way up