Can spark plug wires check out for resistance and conductivity when cold, but begin to fail when hot, then check back out again when you pull them off to test them again? My old GTV6 has a BAD problem of missing, stumbling, and stalling, but only AFTER the car is hot. Runs smooth and clean for 10 minutes then it goes to shit. The symptoms are textbook “bad plug wires, chapter 1.” I’ve repaired and/or replaced literally every other ignition component, checked fuel delivery (OK), etc. The plug wires are damned expensive for this car because they have built-in resistors and each wire is cylinder specific, so I don’t wanna buy a new set unless it’s obvious it’ll solve my problem.