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If your running a power valve with too low a number will do that. I like them 1.5 under in gear idle vacuum. Seems now days where carbs used to come with 6.5's or higher they are 4.5 helps take tunning for dummies with a cam out of equation.

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NEGATIVE..........Doesn`t work that way unless you`re WAY into the transition on the primaries cos when the idle`s correct you can remove the jets w/no change. As far as p/v sizing, take a drive at a steady rate or slight load, look at that # then maybe drop down 1-2 for power enrichment..........