[msvx95]

Something I've been noticing lately is that my idle tends to intermittently hiccup. Meaning it will idle about 650rpm, then dip lower to I'm guessing 400.
I see this problem while sitting at red lights or even while just idling in my garage. It will not do this all of the time, but sporatically. The temp gage is at normal.

Things to note: I have no codes shown, the car doesn't sputter, it drives great, and no loss of performance. MAF sensor (used but replaced 1-1/2 years ago)

What could cause a problem like this or is something starting to fail? I hope its as simple as a defective sensor....