I thought I would update this thread, I found a new old style ac delco O2 on ebay http://www.ebay.com/itm/331712333869?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT I installed it and...

according to this thread on another forum they have a similar proplem with the newer afs75 O2's. when at idle a very narow range witch is what mine seems to be doing....

Installed heated 4 wire O2 over the winter and took vette out for first time with the new O2 and did some data login, noticed the O2 reading are not fluctuating as they should be, so did I get a bad...