The blower is about 2 years old, just started acting up. It's fine for the first 20 mins. then when it gets hot it starts to cut out, especially at full throttle, so I have to back off the throttle to keep it from stalling. It idles fine, works decently at 1/4 throttle but after a while it starts to sputter then too. I put a new spark plug in, cleaned the air filter, cleared the fuel lines and fuel pick-up. Exhaust port and muffler are clear also. Thanks.