Check ALL your vaccuum lines. My '00 had a slow and small vaccum leak that eventually led to it's demise... after only 93k... and it would do something very similar to what you're describing...
Make sure you double/triple check all the connections you may have messed with then do the same thing for your vaccuum lines and such.
Mine, I believe, was actually from not torqueing the upper intake plenum all the way down...
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