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Run the car without the cap, see if you notice a difference.
Are you sure this is not all in your head? I do that to myself quite often. Just hook up a scan tool, it should tell you what the desired idle speed, and then the actual idle speed. Compare the two, if they are close (like desired: 700 and Actual: 675) then I wouldn't lose sleep over it.
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-Mike, Mikey, Michael 
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