Get some straight Seafoam into the fuel delivery(carb or throttle body) system and then let it set for 48 hours. It sounds like your older fuel system is varnished and the Seafoam will clean it. Once you get it running fairly smooth again, use Lucas every other tank and then when you store it for the winter, use Seafoam again, drive it for 30-40 miles to ensure it is in the fuel delivery system and you should be good from then on. I have let 3 different vehicles set for 16 months recently, with Seafoam in them and they started and ran fine after the 16 months. Ethanol is a very POOR fuel, especially if you let it set for months, it will form moisture and varnish.
