2002 Ford Explorer V6 4.0L Wont Turn Over! HELP?

OK so, the truck has recently (last month) had some trouble starting up... only when tank was under 1/2 full. If it wouldn't turn over before I tried to get some pressure in the fuel line by turning the key to Aux which got it working. I tried to do auto start one time and the engine started and then slowly died. After that it wont start up again. I filled it to 3/4 and still nothing. Figured I would replace the fuel filter and that obviously wasn't the problem since it still won't turn over. Does anyone have any suggestions on where to look next? Battery is perfectly fine btw so its not a battery problem either. Someone mentioned the coil pack, is that a possibility? I'm new at this car stuff.. hehe. Please help! I don't want to bring it in to a dealership for $100's of dollars.
 
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