I've presented my KR issues before: had spikes of 4-5 degrees with: Intense PCM, Wizaired cold air intake, and 180 t-stat, on 94 oct.

Since then I've gotten rid of the Intense PCM because of starting issues. And about the same time, I'm throwin 89 in, with my stock PCM.

So yesterday I was watching my scan-gauge for KR and Ign advance, and it was goin nuts!
If I'm going 65mph and accelerate moderately, without shifting out of OD, I'll get a few degrees. If I'm at 70-75 and accerlating lightly, I will see at least 5 degrees, and moderately I'll get 10 degrees. Moderate-heavy accel at 80-85 and I'll have 20 degrees. Set the cruise for 90 with no accel and It'll jump around .5 - 3 degrees.
Slight accel up a hill at 30-35 mph will even pull a few degrees.

I had a slight KR problem before, but this seems out of control.

AHHHHHHHHHHHH!!!!!!!!!!

And as expected, timing will go way down when it's finding knock. According to my reading, with 20 degrees of KR, it will pull timing back enough to loose 40 horsepower.

Yes, I know get the u-bend done, I will be. But that can't possibly fix that much KR, can it? And a mostly stock vehicle shouldn't have that much. There are no DTC's coming up.

Any ideas please!

-Bill