I got my Husky 435 at a yard sale for $50 and it looked like it was not heavily used. It took a bit of tweaking on carb adjustments but runs nice, idles evenly, with a bit of 4 stroke at the top end, but then between cuts it will stall. Starts after a few pulls, but will stall again after a few minutes. Using only ethanol free gas. Any advice on where to start? Thanks, Larry