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First guess is the choke isn't pulling off.
Study the choke linkage, and figure out how to disconnect it.
Start the engine and let it idle till it warms up.
disconnect the choke and try a test drive.
I'm guessing that the throttle response will be there.
They used to make manual choke conversions, and the earlier trucks had manual chokes. They went away as emissions requirements got stricter. You could probably get the manual choke setup off an older truck and convert it.
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