I am having a big problem with my spark blowing out past 20psi. I have changed to msd cap and coil new bkr7e plugs gapped as low as 16 and some new wires. tune is good, 11.6 afs. I run on e85 so I wonder if I need to advance ignition even more and get differant plugs.

 

I don't believe in the spark blowing out but I know what u mean, I know that it takes less energy to arch iridium plugs than any other plugs.

 

if you mean breaking up go to 8s i had this problem and it helped