A vacuum leak will cause a high idle & from the rpm values you posted, you surely have something wrong, like a bad vacuum leak.

Check the PCV valve hose & the PCV valve itself. As has been said, if the PCV valve hose, or the valve itself is sludged up & not closing, it'll cause a vacuum leak idle problem.

When you go to KOEO, does the CEL light up for a self check????

"Pending" trouble codes can be stored in KAM that haven't happened often, or long enough to have the computer turn the CEL on, so if in doubt, have the computer scanned for truble codes & post the Numbers.

The coolant leak won't likely cause an idle problem, unless its from the intake manafold.

Edit: Did the high idle begin suddenly after some event????