So how can I tell what cylinder it's coming from. I run auto light 103's I'm assuming maybe it's time to change them. Mods zzp 10mm wires,3inch down pipe high flow cat res delete straight pipe back. 3.4 pulley 180 stat zzp 1.0 pcm zzp fender well intake. I seem to get 2 degrees of knock from time to time but usually when I don't run octane booster in my tank when I fill up.