Just recently bought a 1992 and 1995 skidoo mach1's. They sat for quite a few years in a garage. Fuel lines bad. They needed a good cleaning. I cleaned carbs, all new fuel lines, in tank fuel filters, new spark plugs. Checked and cleaned fuel pumps. Throttles cleaned. Checked exhaust .all looks good. Also cleaned out fuel tank. Finally got it started after a lot of pulling, but it won't stay idling. What more can I do?