Oh, JEEZUZ, here we go. Spark plugs are about as misinterpreted as tire sizes. I'll fill you in on what I know.
First of all, how often are you checking them? When you yank a plug, and it "looks like new" how many miles are on it? Stock engine? N/A, nitrous? etc etc.
Right now, it sounds like you're a bit lean to me, and really has nothing to do with the plugs.
Give us some more info, and we'll go from there, K?
