What to make of intermittent high idle

[dbaxRonin]

Yesterday I had my computer scanned since my SES light came on again. As suspected, two bad O2 sensors, but that was it (I forgot to write down the codes, but I think it was bank1 front and bank2 rear, or something like that).

Lately, on some trips of any sort of distance, after a while my idle starts getting really high. Today for example, I drove about 30 miles to a mall. After shopping everything was fine. I drove about 1/2 mile up the road to a BW3's and by the time I pulled into a parking spot it was idling at near 2200 RPM. I hit the gas to see if I could get it to back down, but then it went up to over 3000 RPM. I shut it down and went in for lunch and upon starting the car back up after 1/2 hour, it was still sitting idling over 3000 RPM.

I started to drive and in gear, obviously the idles subside a bit, but they are still high. After about a 1 mile down the road, idle returned to normal for the remainder of my trip home.

This has happened to me a couple of times now. Any thoughts on what is going on here? Could this be due to my bad O2 sensors or is something else to blame? '01 i30

[loystock]

Check the entire air intake for leaks - air filter (replace as necessary), clean the MAF sensor (no-residue contact cleaner), clean the TB (be careful and do not spray directly into the assembly) and the IACV. Make sure you identify the malfunctioning O2 sensor and replace them.