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Turnpike Boy,
I am not sure I completely understand what you mean about keeping the secondaries closed until linkage lifts them?
On that carb there are idle adjustment screws on both sides of the carb. I am saying that if you set your idle speed from the one on the passenger side VS. the one one the drivers side it may help your stumble. All the idle speed set screw is doing is opening the throttle plates. Most cases they are open equally in front and back.
What intake do you have on the engine?
Bud
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