The only thing that I can think of would be to check the pressure operated switches that retard the timing. I had a problem with mine just like that, and if the fuel wasn't up to spec. the timing would bounce up and down, creating a very embarassing situation. If you can find it, try using some 100 octane 76 brand unleaded (mixed 50/50 with 92 octane)and see if the problem still persists. Then go for the pressure switches.
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