I had breaking up issues. I went through two set of used stock coils then bought a used Spoolinup cop and poof my problems were gone. Before copper plugs gapped at .020 would not last 500mi. before breaking up under boost.

 

so with all of the advices above, I am having the same problems got a .23 gap in my plugs with NGK plugs. Also running spark tech with cdi. Its breaking up at 6000rpm with boost at 37pounds. Fuel E85 new plugs new coils. AFR and timing are perfect so what I am gathering is to make gap bigger or smaller think I am going to try .20 first. What is every ones input on this? If its that simple, well damn I am doing it right now! I seen something about maf sensor don't believe its that because mine is not hooked up. Also seen something about boost controllers, I have electronic one. Do I need to switch to manual one? Well I will start with the gap and let you all know what happens. After I change my starter because it went out after I put in my new coils on my spark tech.