Yes most stations around here have some ethanol in the unleaded gas.
Find one that doesn't and you'll be happier. I'll wager it's gummy worms in your carbs or injectors.
For carbs, Take 'em off, spray them out thouroughly, every jet, nook and cranny, with carb cleaner (or soak in bucket style) and reassemble. It takes about an hour for 3 carbs.
If you haven't done this in a few years may as well buy a carb gasket kit and change all the carb gaskets/needles/floats while you're at it.
For injectors I'm not 100% sure but I think running sea foam is all you can do (short of replacing them) and hope it clears the jets up after a few tanks.