Well, after trying everything that has been mentioned on this list about
cures for the infamous stumbling problem, it finally came down to a bad O2
sensor and a worn carbon track in the AFM. The O2 sensor was relatively new
with only about 25K on it, but replacing it made a big difference. I fixed
the carbon track by loosening the screws on the substrate and sliding it
forward so the wipers follow a new path. The old path had white substrate
showing through at the high wear point in the middle.

Throughout all this fumbling around, however, I took the liberty of
cranking open my CO adjustment screw in a moment of desparation and
environmental weakness. Now my question is, should I just put it back in
about the same place it was, or is there a nominal starting point from
which it is set before final adjustment with a CO meter? I do not have a CO
meter available and am only interested right now in avoiding drivability
problems until I get everything shaken down and am sure there are no
further problems.

Thanks in advance,
John Clavin