I just miked (2) business cards, one was 11&1/2 tho and the other was 15 and a half tho ! that is doable cuz the vac adv will open it way farther than that in operation. EDIT I did have that one spark same deal when letting off & it was either the ECU or the ballast I forget which. I was hesitant on posting/suggesting that since he has replaced both (& the prob can be elsewhere)