i got a set of ngk tr6es layin around ill put them in and see if it helps. yeah i was worried about the pcm as well but i dont think it would show up as intermittent as it does. on a side note the suspension is roughed up enough that the car wheel hops off the stoplight under moderate throttle. idk if that would cause knock at high speed tho. ill run some vp race gas through it tomorrow after work and test it out. see what it does.