If you are mechanically inclined or have someone that can help you, take the carburetor bowl off and clear the needle and seat. The seat is a rubberized material and will deteriorate with time. You can buy a replacement at http://lawnmowerpartsstore.ecrater.com/product.php?pid=3879031 With a thorough cleaning of the carburetor and replacement of the needle and seat, your engine will run fine again.