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engine won't idle down without bouncing rpm

  • 1998
  • 911 Carrera 4S
120 000

I have a 1998 Carrera 4S that has the issue of not being able to idle down smoothly.  When coming to a stop from anywhere above 30-40 mph, the engine revs to 1500-2000 rpm typically three times before settling down to a normal idle speed.  I've replaced the idle stabilizer valve with only a little improvement, then removed and cleaned it with no change.  This is an irritating problem and I don't know where to go from here.

Any thoughts?

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