I have an HY 30cc Fuelie that will start up but will not run. I've ran 2 gallons through it, and i wasn't haveing problems until now. When it idles the RPM's will go up and down, and won't stay at a certain RPM. It will also die when it gets up to speed and I apply the brakes. It also has problems with the gas tank. It sucks air through the lines, but there aren't any holes in them. When the engine would get hot it will vapor lock and blow gas through the lines and flood the carburetor. Is there an easy solution for this?