Misfire
Fuel? E85?
Edit: nvm I see you're on 93 oct. I would talk to the tuner and see what he recommends. I know someone running some tr7's at an 18 gap but he's on e85 and making more power than you. I would talk to the tuner. Maybe a different plug will resolve your issue
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1st Mach 2nd mustang
Mods: K&N drop filter, Full Mac exhaust with Lt headers, 4:10 gears, eibach sport line springs, tubular cross member, steeda short throw
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