Car idle high when starting up, in park and neutral position?

I have a 2008 honda accord lx-s 148000 miles that has been idling high for awhile now no engine light what are all the possibilities? It idles around 2000rpm at first then slowly works it way down to normal idling but will jump back up once I put it back in park

A stuck idle air control valve may be at the root of this issue. A vacuum leak typically has a surging idle from what i have seen.

Vacuum leak or carbon buildup in throttle body. Remove the throttle body to clean it. Do NOT just spray throttle body cleaner into the intake. Spray it on a rag and wipe the buildup off. Then do a throttle body relearn procedure.

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