Originally Posted by TreeSemdyZee

Check you oil level. If it is high, this can cause issues.

I had this happen to my car last year and it sent the idle even higher than yours. If I stopped at the store after driving for awhile, then got back in to drive, the engine would idle extremely roughly.

Because I had stupidly overfilled the car, the oil foamed and wreaked major havoc.
I had to completely drain the oil, then refill.

Once I did that, everything was fine.