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I had this very thing happen on my newly built HC N/A motor (91 highport). I had to go back and forth with setting idle speed and in and out of timing mode several times to bring it all in line; really frustrating, but I finally got it where I needed it. I had a problem with the idle (and therefore, the ability to set timing, and get the distributor where I needed it). If you are running into the same thing when you unplug the TPS, try unplugging the brown connector off the IACV harness. I was finally able to control the idle speed via the screw, and the timing via the distributor fell right in line.
Hope this helps!
Darrin
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Sad little 91 NX... recovering nicely!
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