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I figured it out... I watched very closely at the computer and zoomed in a whole bunch on the log files... What was happening is I have closed loop turned off for the 0% row, but not the idle 2.5% row.
If you read the manual (oops) it says that it uses the 2.5% row for IAC values between 50-80. I missed that statement (or I didn't understand what I was reading).
What the bike was doing, was the IAC would bounce between 51 and 49, causing it to bounce in and out of closed loop. I think my pipes act a little like drag pipes at idle, and I believe my ET based enrichment values might still be a tad rich. The bike will drop to 49, get rich, bounce back up to 50-51, go into closed loop, lean out, bounce back to 49... and it would just get worse and worse.
Once I turned off closed loop at 2.5%, and adjusted the values just a tad, no more oscillations.
Now, as it gets colder, I just need to finish getting the -16 , 0 , 16 ET based enrichment cells tuned, and I should be done (famous last words).
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