MSD boxes do go bad sometimes. If you dont identify a different issue, might be a good idea to buy a backup box. Then if it strands you all you have to do is pop that new one in.
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1967 Firebird 462 580hp/590ftlbs
1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455
Owner/Creator Catfish Motorsports
https://www.youtube.com/@CatfishMotorsports
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