if you say you throttled up and the engine is not getting high enough rpms. but the enine is not choking on excesssive fuel being pumped in or missfiring? take the aircleaner off of it start it and throttle it up and give a couple quick shots of carb cleaner ( i like berkley 2+2) if that makes the engine surge you might have a gum up problem. bu t i would also take a look at the throttel linkage and the springs. and check the govenor( if there is one)
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