So, ends up as

Dead spark plug. Cyl 5. Infinite resistance between plug cap and electrode. Lead is good: tested with HEI tester and spark was a brilliant white/blue.

Just zero arc in the chamber: no fire.

And apparently it was failing during my drive home yesterday. Buffalo usually gets 18-19/gal on that run and when I filled up, the mpg was 15.7.

Easy enough fix (other than #3, and if you’ve ever worked on an S10, you know what I am talking about.) Just no parts stores close by, or open late enough today.

Guess ya know what Ol Dio is doing tomorrow,,,,