EFI distributor question.

[corkscrew]

Ijust put in my mallory EFI distributor and fired up my engine. after driving my truck for about 5-6 miles, the motor just shut right off. After towing the truck back to the garage, i notice that the center piece on the inside of the distributor cap has been disintegrated. Any reasons why this might happen and how it could be fixed?? a spark is not being created so we know this is the problem but we dont know why and we dont know how to permanently fix it. any help would be great!