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I too have the same issue but only when combined with a certain set of circumstances. If I am cruising at a rather constant rpm (2500-3000) for an extended period of time and do not rev the car with load (not just blip the throttle) my car sill diesel and then kick back some smoke through the carb. If I run it up to 5-6K just one time before shutting down it seams to really help. My engine is also a fresh rebuild but in those so excessive carbon in the combustion chambers is out but that doesn't mean there isn's a little accumulation on the plugs as I would suspect under tame driving. Best wishes!
P.S. - If anyone asks why just tell them that's how race engines work.
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