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They put a solenoid in the idle-low speed circuit which shut off fuel flow when the throttle was closed until engine RPM dropped to a little over idle speed. The last of the NAP-Z 4 cylinders (200SX and trucks) had a heated screen in the carb to help with atomization (early mid 1980s). Also a "gulp" valve that had reed valves to allow air to pass through the engine when decelerating, without any fuel.
regards
Mech
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