Idle RPM just changed - help!

[CTDiesel at aol.com]

On my 5 cylinder JT engine i was driving along yesterday morning and all was
normal.  Then i headed home and when i got home in the driveway the Idle rpm
was at 1600 instead of 850.  I flicked the gas pedal but no change.  The idle
stabilizer valve buzzes fine but i'm not sure what happened...nobody has
touched anything under the hood and all of a sudden the idle is super high.

Any ideas or BTDT?

DJ