I just bought a 89 fleetwood southwind. The generator starts up fine and idles good for a few minutes. After it warms up it starts its surging sound. If I turn on the AC or the microwave it stops surging and everything is fine. I have done some searches on the web and I have come to the conclusion that I need to change the fuel filter and take off the fuel line and put it in a gas can with fuel injector cleaner in it and run it with a load. Do you guys have any other tips?