Alright, back to the real issue...

While I was doing my last tests I was having timing / fueling retard... This could come from pre-detonation... So, I swapped from Denso Iridium "hot" plugs to really "cold" AutoLite plugs... Still had no change... So, now I'm going to try a silly thing and install one "cold" plug and one "hot" plug per cylinder to see if my data changes...

Can you say WAY TOO MANY PLUGS ?