2003 Ford Expedition turning off when idle...

[chizel81]

I have a 2003 Ford Expedition. I have had no issues with it until now. Its always been parked in our garage but recently we have had it parked in our driveway (we live in Arizona and its HOT out) and this is when the problem started. It been just turning off. When we come to a stop, stopped or driving down our road. No check engine light comes on and it starts back up right after. We noticed the battery was loose, tightened it down and replaced the fuel filter. We parked it back in our garage no issues. Parked it back in the driveway, then has we were parked waiting to pick up our daughter a few days ago, it turned off. We had our A/C on and we noticed the air lower and the engine slowly start turning off still it just stopped running. Now the last few days its been running fine, no problems yet..so any ideas!?