After quickly looking through the information that Sam postsed, I imaging that you either have a bad connection, or the idle module has failed. (BIG THANKS to Sam for doing all that research. I really didn't have time.) It didn't surprise me that there is a module for the idle control, I just didn't know how advanced a machine it was.
Look through the manuals and see if you can fix it. If not, yes a generator always runs at 3600 RPM. Just as Sam suggested, disable the idle control and set it to run that fast.
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