Hey, I think I figured out the problem. I'm so stupid... after resetting my ECU the other night, I forgot to set the sensor type on the S-AFC. I set the fuel and everything, but I think it was screwing up the signal because it was set on Flap sensor. I think this was the problem, because I'm no longer hearing that crackling sound.
Ed, I know that you put in colder plugs after your rebuild (7's I think). How much did that help with your detting?