I recall this happening on cars and light trucks in the early "70"s when the idle timing was retarded and the carbs leaned out for emmission control. The fix was an idle speed solenoid that shut the throttle plate completely when the ignition was switched off.
I would check the timing to make sure it is not retarted at idle and that the idle and main jets are the correct size and then look for air leaks that allow air to bypass the carb metering section.
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