Ok I have a 383 with a Pertronix equipped distributor. I run a digital 6 box for most of last summer then the car began to cut out and die at different random rpms and speeds . I thought the msd box was bad,when it was disconnected the car ran fine so I sent the box in to be checked-Msd sent a new one to me and later called after running checks on the old one that it was good. I hooked the new one up and have NO fire but the box shows it is functioning correctly. I've added grounds and checked all wires but still nothing. I'm wondering if anyone has had similar problems? The only thing I have not done is swap the distributor out to eliminate the Pertronix. I'm going to borrow one as soon as I can find a loaner but I need some opinions please!