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Try giving it a little more fuel between 1300-2000 rpm at 0 throttle. If that doesn't work then increase the timing as it falls towards 1000rpm at 0 throttle. For example typically at 0 throttle you will have practically no fuel because of the extreme vacuum on deceleration and that throttle column typically has no or little fuel above the idle point. If you start introducing fuel and or timing at 2000 and increase it as it reaches the idle point then it should catch the falling rpms.
I use a catch can for the oil I didn't want the gunk going back in the engine, it ends up catching mostly water.
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David
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