Engine stall and won't start

I have a 04 Durango with the Hemi. The engine will just shut down occasionally and then won't start back up. It also won't start up whenever it doesn't feel like starting. The engine will rev up to 2000 and turns off. I have gotten two codes but I can't find them anywhere. The codes are p 513 and P 2175. Does anyone have any suggestions or know what the codes mean? The dealer is useless right now.

There is no p 513,is it p0513?that is for an invalid skim key.that would make it start,run for about 2 seconds and die.
p2175 is low airflow,or intake restriction.I have only seen that code once,and it was a bad map sensor,but it could be other things