Your symptoms all point to a lean fuel mixture. See if you can get it to run better by gradually closing the choke while under load. If you find a choke setting where it runs better, a lean mixture is the culprit.
Some possible causes:
1 - Restriction in the fuel supply (plugged sediment bulb or carb inlet screen, junk in the tank covering the fuel outlet, kink in the fuel line, etc)
2 - Carb float set too low. (This is unlikely – can usually be compensated by tinkering with the mixture screws a little)
3 - Junk inside the carb is plugging the primary fuel circuit. Also possibly grossly misadjusted carb high speed screw.
4 - Vacuum leak at the carb to manifold and/or manifold to head gaskets. Also since yours is a dual fuel manifold could be it’s rotted internally and is sucking exhaust directly into the intake manifold.
5 - If the manifold heat flapper is set at “hot” it’ll cause a lean mixture when the engine warms up – especially with the crappy “emission friendly” gasoline we’re now forced to buy.
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