well we didnt sand it down or anything, but its not filthy..
but would that cause the diag tool to say the coil is bad or keep the coil from running all 4....
we've tested the coils resistance (or somethin, what chiltons said) and it doesnt match that of a good coil....
we've gone through 3, i just have a hard time thinkin they are all bad on arrival (like my brother thinks). we called a mechanic and they suggested towing it to a electrical mechanic ($$$$$$$).