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If it dies off throttle at idle it is likely an intermediate circuit like the pilot, or an air/fuel screw bypass.
Do the throttle cables go to a butterfly or to the slides? If they go to a butterfly the carbs are vacuum operated and rise with engine RPM, they pull vacuum from the intake which pulls them up. If they are vacuum operated pull the tops off and check the diaphragms to make sure there are no tears or holes.
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