I think the MSD coil is remote and they use a cap cover. Maybe there is something wrong with this setup. The first thing I would try is a new cap and rotor and the stock in-cap coil and see if it still does it.
I use an Accel in-cap coil. It uses the little button rotor contactor, with the spring, rubber washer, and dielectric grease like the factory coil.
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1979 TATA Extreme TKO .64
Hedman elite; Pypes 2.5; Borla XS; MSD 6A; Edelbrock intake; open scoop; Sniper Q-jet; Powermaster 150; 4 core radiator/Mark VIII fan; RobbMc mini starter; subframe connectors; solid body mounts; fiberglass rear springs; poly sway bar and link bushings; 81 master; D52’s; Blazer disks; 225/60 & 235/60 17's TrueContact's; relays for PW, PDL, lights; keyless entry
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