How old is the stalling genetic?
Has it been run unloaded or lightly loaded for a portion of its life?
If your lucky you might be able to load bank test it for a couple of hours and get it accepting load without stalling,
Plug in a 2kw heater for a couple of hours and see if it improves the load accepting,
Used to have to do it to rental gensets that had been lightly loaded while out on hire,
Everything gets gummed/coked up and you have to get it hot enough to burn out the crap....
Cheers
Dave
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