Thanks everyone for the points.

Yes - the ALDA was removed way back toward the start of this - with no change. But so many other things have now changed I thought it would be a good idea to pull the ALDA again.

Also toward the start of this working this issue - I reached in and spun the turbo shaft to check for binding and/or play in the shaft. No clear signs of any issue.

I have a spare IP from a parts car that I know works - so was thinking of swapping IP's - and not a rebuild.

OK - HELP me understand the overboot protection "thing" - where/what is this? I've seen posts mention it - but I don't know what it is and what it does.

Thanks,

-John