Your last post makes me think it is either the distributor or water in the fuel. Your distributer sounds like you have been playing with it for awhile so use your own discretion.
As for the water it sounds like you should try some dry gas. You should have less than $5, in that. My guess is that it is water in the fuel. Like Maine said it could just be condensation, my guess was based on the proximity of your car to other college students ==== potential random drunk idiots.
Is your fuel cap sealing properly? Does it feel loose when you tighten it or does it fit snuggly like it should? Generic fuel caps are fairly inexpensive as well.