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blowing out spark isnt gonna make the tach drop to zero all of a sudden if everything else is getting power and the engine is still rotating. It would dip a few hundred RPMS but not to Zero
Def sounds like a power loss if the tach just drops to zero all of a sudden, especially if its random. Sparks plugs arent intermittent they either work or they dont.
My S13 had a similar issue with randomly shutting off, turned out I had a bad chassis plug that a wire inside the plug corroded and broke.
For shits and gigs I would check plug gap, but Def would check harness plugs and grounds.
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