Well , I think I found out but not sure. I have a performance ignition module and a MSD coil and was told I could do 55-60 gap on the plugs. Well if 55 is good I will do 60. It idles smooth and get up to rpms perfect. My problem is about 3000 rpm if I let of the gas quick it will shut off when the rpms are coming back down. What you guys think? I think I might of passed the sweet spot just a hair.