[azflycaster]

I went to change the oil in my Honda EU1000i today and the engine was stumbling while I was warming it up before I changed the oil. I went ahead and changed the oil, cleaned the air filter, checked the plug and cleaned the exhaust screen. I also dumped the fuel and added fresh. Every thing looked fine, but it still stumbles. It is very noticeable when on Eco throttle. The stumble is at a regular about one second interval and it recovers right away. When Eco is off it just seems to run rough, but I am sure it is related. The generator is two years old and has about 25-30 hours on it. Any ideas?