I have a missfire problem on the cossie , If you nail it it missfires then clears, but if you go half throttle, 3/4 throttle, then full throttle it is fine.
My car is running 21 psi boost and Champion C57's. Would i be better running NGK9's Gapped to 0.65mm and get a new Dizzy cap and rotor arm ??.

Cheers,

Alex....