Stop at Wall Mart and get a can of BerryMan's Chem Tech. Dump entire can in tank with whatever gas you have in it. The less the better. Run til you have to fill up. You will see a difference. If money is no object do this with the Sea-Foam but 9 bucks a can compared to 4 bucks the Berry Mans does just as good when needed I just don't like to use it all the time. It is a little harsher cleaner than Sea-Foam but will do a great job when carbs get bad. Sea-Foam is great for maint. but Berry Mans is great shock treatment.