Well, a surprise just happened, but first let me give you the background. Monthly I start my two generators (Kipor 3000 for camping and Generac 8000 for the house backup). When I did this in April the Kipor made an awful sound, like there was loud exhaust leak and it wasn't outputting 120vac. Oil is fine (changed at least once a year and I only use the unit a handful of times).
Well I decided to have the shop take a look at it, moved it near the truck and decided to start it again, and been running over an hour like a champ.... smooth, quiet, and running about 2000 watt load without any issue.....
Gremlins?