Well, first there was a moth, and now, an O-RING!!! (except I got the moth with the Shop-Vac)
It was idling at about 2,300, and I pulled the IAC, to put my finger on the IAC-to-plenum inlet, to MAKE SURE I had a seal.
A tip: DON'T DO THAT.
Never even saw the O get pulled; it was so fast. She never even hiccuped. I smelled a puff of burning rubber, and saw the missing O at the same time. By the time I shutdown, and smelled the exhaust tips, I couldn't even tell which side took it.
Anyone wanna' buy a Z? Complete with documented F*^#@-ups!!! I might even pay ya for removal...
Anyway, I got a new O-Ring at Advance, same size, slightly fatter, plugged it in, and everything SEEMS like it was before. Idling about 900, occasional lope up to 1,000, down to 825.
Would the burned rubber foul the O2 sensor? DM O2 readout didn't show anything different after the O pulled (I had watched O2 readout before).