I've tried a few more things, and am still getting nowhere with this problem. Anytime I go into boost and am up around 100 in the MAP readings, I get way too much knock retard.
-dealership fuel injector drop test: no problems found (p0420 code somehow hasn't returned since this)
-compression test: all good at 180 lbs. in all cylinders
-MAF tuning: No Effect
Here is a current scan (no wot) that shows if I push the pedal down even just a little too hard, KR is there to remind me:
2210 from xxrzdxx -- Scan Depot dot net
Some of the scan is while waiting on drive-thru, but it is there in hopes someone can also identify the occasional sputter/vibration during idle. Scan was made with the Powertuner this time.
I really don't know what else there is to do, that I haven't done already...besides having to drive around like an old lady.
