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Old 04-29-2012, 05:41 PM
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Connect the vacuum advance to a full time manifold source for starters, this is a source that pulls vacuum full time, including at idle. Now recheck the timing, it should be around 20 to 24 degrees before top dead center. When you do so, the first thing it's gonna do is idle up, which you will lower on the idle setting on the carb. Once you have it at the correct idle speed, set the idle mixture on the adjustment screws. With just plain 12 degrees timing, it likely doesn't have enough advance so to get it to idle you have to open the carb up off the idle slots to get it to idle, this causes the carb to draw off the primary boosters which results in idle problems.
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