I have a 10 hp engine on a 5000 watt generator. Its about 10 years old, mostly kept inside, used little. I got it out yesterday and ran it. It did start and run on bad gas...I changed it out to new gas and it ran rough for about two hours. did not overheat that I could tell. It shut off and I have been trying to start it again. It will fire up and run about 3 seconds and shuts down again. Eveything seems OK. Fuel is still making it to the carb. I took the bowl off and dumped out the gas even though it looked OK. Any thoughts what to check?