Been having some issues with the '91. Running like hell, smelling like raw fuel along with all the other symptoms of a misfire. Checked all the plugs, wires, coil etc. Turns out the 6 series was the problem. bypassed the box and the car runs and drives perfectly. Been doing some reading and it seems like a lot of people have issues with the 6AL. They dont seem to last too long, this box has been on the car since January. Always buzzed very loudly, but others have said the same thing so i didnt figure it was an issue. Havent taken the box apart yet to see if it burnt up, shorted out, etc. but just curious if anyone else has run into the same problem? is there any way to bench test these ignition boxes? Havent contacted MSD yet, thought id check with everyone on the boards first.