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Do you have a gas cap? Did the truck go without a gas cap for a while? (a red rag is not a gas cap) Does your gas cap seal very well?
Water in the fuel will cause this too, and will make you go crazy tryin to figure it out.
Buy some water remover...or just dump 1/2 bottle of rubbing alcohol (the stuff in the medicine cabnet) into a full tank of gas.
It sure can't hurt, and at a buck or so...it is worth a shot regardles of the cap/condition.
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