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Old 01-04-2012, 06:41 AM   #2
san rensho
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Join Date: May 2011
Location: Miami florida
Posts: 1,591
Yes, it should run rough with the cap off since there is now a vacuum leak in the intake system.

To check the AOS, put your hand over the opening to seal it. You should feel just the slightest amount of vacuum.
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