Yeah, I know that things like coils are often tied to temperature. When cold they can work fine, but when they heat up the resistance breaks down and they fail. IME usually it's a rise in temperature of the coil gets you an increase in the resistance when it starts to fail.
I'll see if I can't find one of those neon light testers and do a road check. When I limped home the other day, it ran fine for 10 miles after I left the house, but then started cutting out on one cylinder intermittently until it finally ran on just one cylinder constantly for about the last 8 miles back home.
