question ? .. do MSD boxes go bad ? .. i went to MSD ignition 10 years ago and it immediately stopped my problem of fouling plugs every week or so .... i never really paid attention to how it worked while it worked well .. now i am back to fouling plugs too often and my engine will not smooth out till about 3000 RPM .. it has a big cam but not one that big .. it`s a 6 AL i think ..