Check your DTC codes.  That would be your starting point.  Look for a bad coil...failing ignition module...weak grounds...the possibilities are endless.  

try checking batt termanals for  corrosion and the fuseable link that comes off of powerline from battery to the starter,,,,,,,

Easiest and first thing to do is to get a wooden dowel no thicker than say...1?4 inch. Stick it all the way in your fuel tank till it hits bottom(WITHOUT dropping it in) and pull it back out just like a dipstick checking oil. Senders go bad, could be out of fuel.