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Thanks, still scratching my head though. O2 sensor when connected drops my idle by 200 rpm. Once disconnected it raises back to 800 steady. After a long drive this behavior at some point stops and it sits nicely at 800 at all times.
Im wondering if perhaps its just time for a new 02 sensor. If the O2 sensor is dropping RPM the O2 must be reading Lean I assume, and adding more fuel slowing combustion.
Another reason for thinking its the O2 sensor, is that I adjusted the AFM mixture from 12 turns out (set by PO) to only 4 turns out. This would have richened IDLE, so doesnt make sense that the O2 at idle is throwing more fuel in via DME just as before.
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