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Old 01-17-2011, 09:28 AM
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1971BB427 1971BB427 is offline
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A couple things can cause the mixture screw to not affect idle. It could have a vacuum leak, or it could be a worn seat in that side and it's still flowing with the screw all the way in. Try gently seating it with a little pressure, then back it out a couple turns and see if that helps.
Check for leaks around the carb with starting fluid sprayed at the base to see where it might be sucking air.
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