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Something with the Torque Converter? Idle set wrong? IAC? something there I bet. Does it Act like it will quit than usally settle down or all the time and never stops?
Hows your tranny Fluid look? Any vacum leaks? You will hear a seeping noise. One thing I would maybe try is, remove vacum from brake booster, (Keeps revs up watch them though. Start and put in drive then into park and see if the same thing happens. My guess it just something with the idle. Mine drops a bit when I put it into park. Mine doesn't even idle steady it jumps a bit up and down.