[T E Lewis]

Tony,

I've had the same issue come into our shop a few times. Your discription makes it sound like it has to be an ignition problem. Although a lot of people install their MSD box in the engine compartment and never have problems with them, the box really does not like being in a heated environment. We generally mount them in the top of the footbox area inside the car. Go to the MSD website and go to troubleshooting to test the box. If the box test good, then you only have 2 other parts to fail, the pickup in the dizzy or the coil. It is most likely the coil. It should be an easy fix.