The usual classic story...my car ran perfect a month ago, then I did a bunch of work on the car (non ignition work lol) shocks/ battery relocation/ power steering bracket/ new power window motor/ tail lights/ cluster lense/ cleaning...went to start my car one day and no go. The motor turned over, but there was no spark at the coil. So after a lot of hunting, I decided to remove the MSD 6AL box and it fired right up. My last MSD box went out after I went over rail road tracks at 5mph. I always mount them well FTR.