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Hello, my name is***** will assist you.
What this is sounding like is that you have either the #3 or #4 carb flooding slightly and bringing the RPM up some. When the fuel runs out, the idle will drop back down to normal. This engine does not idle on the bottom 2 cylinders, they are activated by a booster pump in the throttle linkage and really only are supposed to come in around 1800 - 2000 RPM.