I've had starting issues this year. I have had the generator since 2012. I have maintained it properly and run it at least an hour twice a month during this period. All of a sudden it would not start. I've drained the gas tank and put new fuel, new spark plug and changed the oil. The reason I drained the tank is to have fresh gas in there. Previously, I left the tank at least 1/2 full to avoid problems with condensation in winter months. I used stabilizer at all times. I took the air cleaner apart and cleaned it. Also sprayed starting fluid in the carb chamber and it started right up. Next, I checked all fuel lines - fine. Took the carburetor out and cleaned it and blew out the chamber. Put everything back together, and it started right up. Only problem is it shuts off once the motor gets to the point where it smoothes out. So, it runs for approximately 5 minutes and shuts off. Any suggestions?