Did I Goof.....?

[CatMan1]

I was putting off last year changing the gas valve. It had started to leak, not shut off completely. I hadn't driven the car since last fall sometime. Yesterday we drained the 2 gallons of gas and changed the valve. Everything went back together fine. We even cleaned out the sediment bowl, which had a decent amount of fine sediment in it. No leaks so we filled the tank and went for a drive across town. No issues. Drove back and then going up a hill it began acting fuel starved and then would straighten out.....for a bit. It's always possible it is from setting for such a time, but I don't use Ethanol and I most likely put Stabil in. It's possible I got bad gas. How can I tell if there is water in the gas? The other possibility, and more likely so, is that I forgot to buy and install one of those little screens in the tank above the valve. The old valve had a raised tube on it, but the new one doesn't. I guess it's back to the drawing board. Probably shouldn't have topped it off.......