Air / fuel ratio.......

[Darwin busa 01]

11.5-11.8 will be safe, on boost
13.0-13.0 off boost.
regap the plugs to .020", if its surgingcutting out a bit on cruise drop the off boost to 12.8 or so,
Tight plug gap fires the rich mix easier, but can misfire on leaner

Thanks for that info that helps me out a lot,