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I have a 03 Triton 5.4 F150 FX4, with about 150k miles....Recently while driving it in the rain it died and would not restart....Once it dried out and set for about two days it started and ran fine until it snowed and got wet again....It does crank and fires just won't start.....Any ideas

 

check for bad connections/corrosion...sound more electrical in nature.
are you missing spark or fuel? With some help... disassemble the air intake and give a brief spray of carb cleaner/starting fluid, (not much)...while having some one turn over the truck, )...if it wants to start or briefly runs then your missing gas....if not your missing spark.

missing fuel ...when was the last time you change the fuel filter? kinda doubt that this is the issue, but I tossed it out there.

can you hear the fuel pump prime up when you turn the key just to the ON ??...not all the way over to start.

couldn't hurt to clean the IAC.

prolly a bad relay