it only dies out when i stop and it idles really low. like 250. normally would idle like 750 to 1000. but when im low on gas it just does that then dies. on the freeway it drives fine.
it drives fine until i stop. i always have to keep it filled up.

You need to have fuel system checked by qualified repair shop. It could be weak pump, restricted pick-up,clogged fuel filter, bad fuel level sender or combination of above. It needs checked out before it leaves you stranded