I have driven a bit more than 100 miles since the fix. The key is that the codes (CEL) will re-appear after three (mixed) driving cycles, if the problem persists. I have driven three cycles so I hope I've got it licked.
I believe that a stuck IAC will cause those codes. But others more savvy here can comment difinitively.
It's also possible that the K&N has deposited some oil on that new MAF sensor, especially if it was cleaned and then over-oiled.
I replaced my IAC valve even though I didn't have any idle problems - still don't. Stupid me. The new one looks like a re-design/upgrade so maybe it wasn't for nothing.
Best of luck, Glenn.
LLL
