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What i'm saying is that i did close them all the way and the engine didn't die...it just reduced the idle speed from 800 to 600rpm. Since it didn't die would that be a symptom of a leak?

IMO if you had a vac leak that would lean out the carb further. and it should shut off. However every combo is different and depending if the needle on the mixture screws could still let some fuel thru if not seated correctly. Also how far are the throttle blades open if open too far you could be not on the idle circut off the carb??