2003 Ford F150 Supercrew Won't Start
 

My 2003 Ford F150 Supercrew will not start?? It turns over but will not fire. This happened earlier today and I waited 10 minutes and it started fine. Awhile ago it has done the same thing. The first time it was towed to the dealership and they said we got a batch of bad gas. Then the second time it had something to do with a download for it to start in cold weather. Does anyone have any idea what it could be or what I can try to get it started? Thanks