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Good idea to look for intake-leak. Idle @ 2000rpm even with idle-screw all way out is sure sign engine is sucking in extra air somewhere.
Someone one posted they had one intake-boot with rip in it that caused extra air to be sucked in and high idle.
Another person posted recently that installing rubber-boot backwards caused them some issues as well. It's labeled "carb" on one end, that one should face towards carbs.
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