Check vacuum pressure, check in a couple different places and with/without lines connected (booster, HVAC etc). I'm not sure if there is an actual spec or not, I remember seeing 24-26 in.Hg. I would probably consider anything under 20 in.Hg to be low. If you have low readings, check directly at the pump, and see if increased RPM changes it. Increased RPM should not be needed to get a better vacuum pressure reading, but it might indicate a vacuum leak or weak pump.
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