I was running NGK 1 heat range cooler...And I ran those far too long.. Say 60,000 or so and was seeing upwards of 7 degrees of knock then I changed the plugs out tongk tr6 iridium's.. And added plug wires and coilpacks from zzp.. Before I was running msd coils.. And also put a ported to on from zzp.. Like I said earlier in the post, car runs like new at light , half and three quarters its that damn full throttle..

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