i own a 2001 lightning, just did a pulley upgrade and a couple of other things..its making 14psi as of now. i took it 2 a dyno shop and had them tune it and now it is starting to pop when it downshifts and if i take it above 100 it starts popping alot, i already regapped the plugs and i put nothing but 93 octane in it...is there anyway to make this stop? putting a fuel additive maybe to up the octane add timing? remove timing? idk but it runs good and all but the detonation makes me worry that eventually my motor is gonna go...so if anyone has any answers or suggestions, plz let me know! thanks,
cj