car starts then dies on 2005 Lincoln LS

HI. The car was running great. I ran into to pick something up, came out. Car started flalessly and then the RPM's dropped and it died. Tried several times. No luck.

2 answers
This could be several things, sounds like a fuel pump, but that is a pretty wild guess. I would get it to a shop while it is having the problem so they can diagnose it.
mass airflow sensor