It has nothing to do with the plugs. That's the nature of modular motors. You are in pretty low RPMs in 5th gear at 60. You should never stomp on it in 6th gear ever...ever ever. It is ONLY an overdrive gear. 5th gear is 1.1. You should only feel it really pull if you're over 4k rpm. Peak power is in the higher RPMs. These motors like to wind up. They are not like the pushrod style LS motors which hit their peak tq down low. Downshift and blow the camaro out of the water.
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