I have an idle that random sticks high with slow to settle down to normal idle speed issue, I checked intake manifold ok no leak,
the idle air intake screws are set at best idle ,jets have check clean, the needle valves new , float heights good, throttle stop set good with throttle cable`s setting good ,,I think to next check slides are not sticking? idle adjustment at throttle sync connectors?
trouble shooting these old carbs can be very wearing on the patience