Cruise Control
My '99 Civic Si had problems disengaging the cruise control. As a result, it would rev for a variable amount of time after using it -- maybe 5, 10, 30 minutes. The problem happened when it was cold out, so I'm guessing gunkiness of the cables. My guess is with your DX, you don't have cruise, though - so a cleaning of the throttle cable, or as indicated in the owner's manual, a check on the idle speed should be done (especially at the number of miles you have).
I could never get the service techs to replicate the problem, so I just lived with it -- it never went over 3-4K rpm, and went away in the Summer. I sold the car with full disclosure of the problem to a private owner. I wasn't concerned as I would be with an automatic with a similar problem.
RH77
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