Update....
I could not get idle to settle down.
So......
Took it to an Authorized Onan repair person today (took me in on short notice and only 45 min from home). Installed a new OEM Onan carb and then found that Governor rod had become stuck and way out of adjustment. Cover had to be removed to access governor linkage which is at center/rear of generator.
He adjusted linkage rod and also set RPM and frequency to exact OEM specs using a digital frequency/voltmeter. Apparently this procedure is used to adjust the governor to bring frequency and voltage within the specified range, and to set governor stability.
All is well now..... it runs better than it ever has!
AC and microwave both on and it runs smooth as silk!
I'm a happy camper!
