Time for a heated O2?

[Roc87]

I've had a weird tuning issue with my GN ever since I've owned it. I've replaced the O2 sensor more times than I remember. It idles around 800 millivolts, about every 20 seconds the idle gets really rough and I noticed that the O2 drops to under 100 millivolts the whole time it's idling rough, after a few seconds (Sometimes) it smooths out and the O2 comes back up. I've checked all grounds, vacuums, etc....and everything seems fine, I have about 22 on the IAC at idle in drive, and 5 for the MAF. It is an AC Delco O2, and I think this weird problem is why I used to get a check engine light (Before I got DS). Ideas???

 

[OneLethal87GN]

My O2s drop below 100 alot. Seems like everytime I let off the gas to slow down they drop to 000. They come back up after about 5 seconds or so, or if I give it some gas. It also drops to all 0s when I let off after flooring it. Maybe it is just the way they are? I know it's not my Scanmaster because I also have a a/f gauge that goes all black when the SM shows all 0s.

 

[Roc87]

Yep, mine does that too, but this problem is just letting it idle. They do come back up right after I give it some throttle, but otherwise it stays under 100 for a while and the O2 cross counts stop....