cant keep it running

Possible bad gas? What do you mean it was driven once? While you were gone, or what?

IAC

In addition to the IAC
I'd try a bottle of HEET (I think thats what its called, the stuff you put in your gas to eat water).

I left my stang undriven and un started for 5 months last year and she started on the 2nd try no issues.

In a few days I'll be driving her for the first time since Nov. but shes been on a trickle charger this time.

OH check the make sure your air filter is clean and make sure you didn't have any mice move in while you were gone (had that happen before).