[longhornchris04]

When you say you were "without O2" did you still have the lambda system installed and active - i.e. just disconnected the O2 sensor - or did you disconnect the power supply for the lambda system.

If its the former then I'm stumped. You will need to provide more info.

If its the latter, remember that the lambda system always runs the frequency valve to reduce the control pressure, even in open-loop. As such, if your system was tuned w/o the lambda functional at all then the lamba in open-loop is is running way-rich, probably beyond the capability of the system to correct in closed loop.

If you can get a CO meter, I'd adjust your CIS via the bently instructions. Another option is to wire a multi-meter up to the O2 sensor and use its readings in place of a CO meter in the tail pipe.

As an aside, I had to adjust my CIS (no lambda), as it was running rich. While futzing with it, I got my directions backward and too rich resulted in the following:
- hunting for idle
- stumbling on initial acceleration
- failure to "capture" idle when coming off gear. Basically if I went to shift my engine idle fell like a rock. If I popped the clutch at ~4000, the engine would nearly stall.

Just once, I stalled the engine out by adjusting way-rich (slowly) and right before it quit it sounded like a cylinder or two weren't firing.

If these sound like your symptoms, then you are probably running rich. Re-tuning per the manual (which tunes with the lamba in open-loop) is your best bet.