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Are you sure that it chokes out and is not starving for gas? If during restart you treat it like its flooded and it smokes on restart, it is choking out. If it just needs to crank to refill carb bowl, it is starving. The item below the driver door is probably either an additional gas line filter or someone has installed an electric inline fuel pump in addition to the mechanical one. If it is not working properly, it could be cutting off your gas. The line going from the carb to the right side manifold has nothing to do with vacuum. It is merely a heat tube, which heats the carb and turns off the choke. If it is severely plugged, no heat is getting to the carb and your choke will have to rely on manifold heat coming up from the engine to shut off the choke. This could also make your vehicle flood out, but unlikely. It sounds to me like either a gas starvation problem, as it happens at high RPM, or like the previous reply said, you are loosing vacuum, which is used to open the choke up.
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