question first .... it did throw codes because you didn't have the O2's hooked up .. right?

After installing the O2's did you reset the PCM? If the codes are still there sometimes they act funny if you just hook something up with out unhooking the battery.

Stupid ?? You sure you got the O2's hooked onto the front plugs and the simulators onto the rears?

Are they old O2's out of a wreck?? One or both might be FUBAR.

just getting the silly, DOH, stuff out of the way .... lol