I have a 10 year old Craftsman snowblower. I can start it easily but when I go to a higher throttle setting it will act like it is going to stall but suddenly come back to life. It will repeat this every 5 seconds. I can see the trottle assy and linkage moving back when it begins to lose power and comes back the opposit way when power is restored. If I move the throttle control lower this problem goes away.