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This is the 3rd MSD unit that has failed in the last week. My car is a 74 Plymouth Duster with a Slant Six. Motor is new and engine bay has been completly redone. On all grounds are on bare metal. Car starts and runs great for a while then starts to run rough then dies and won't restart. All...

MSD 6a, MSD Blaster Coil bypassed resistor. Car was running fine I went to the store, on the way there it started to hesitate a little almost like a miss fire. Car sat in the parking lot for about 20 minutes while I was in the store. Tried to start and no fire. Plenty of fuel no spark from coil...

Just installed a MSD 6A unit and Blaster 2 coil on my 74 Duster with a 225 Slant Six motor. The instructions state that you no longer need the ballast resistor. After hooking up the system it would only run with the ballast hooked up. When I tried with the ballast unhooked it started but would...