Not for Nuthin' But Close!

[Nmbr1GMfan]

Originally Posted by Mark Yacavone

Does the timing go to zero momentarily, when you mat it?
Some of them have that little trick, too.

It's like a scavenger hunt finding all the nannys. There might be multiple tables throughout controlling the same thing and one may over ride the other. Another thing is to put some good fuel in it and log knock retard, if you see any it's probably false. Start de-sensitizing the knock sensors until it stops pulling timing for no reason.