That is what I am now suspecting- some sort of vacuum leak. Car does not have ac, but has power brakes. I am thinking that the line going to the power brake booster might be leaking, or it could be the outer carbs, as others have suggested. I will also check around the intake manifold. The car runs fine otherwise, so I don't think it is anything too major. I will let you know what I find. Thanks again for all of the good suggestions.
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