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if you have to lean the fuel to get idle to come down then you must have a vacuum leak or two.when the throttle is closed the idle valve should be the only place that admits air into the intake.the idle speed computer if working correctly will keep speed down to 650-700.if you add more fuel and speed goes up then unmetered air[vac leak] is getting in.also at idle timing should be 12 deg btdc not 15.
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