Depending on where the POP came from (tailpipes?), take a look inside the distributor cap and at the mufflers:
The cap to make sure the rotor & center electrode are fine & no carbon tracking.
The mufflers to see if they look a bit swollen, or worse, from fuel lighting off inside.

Had a similar deal, though it didn't interrupt electrical power, on a vehicle a couple months ago.
The center electrode in the cap had apparently dislodged & been hit by the rotor's tang, leading to a crossfire.
It had been running perfectly until it started backfiring a few times.
Oddly enough, it stopped backfiring and I drove it home (about 5 miles), during which time it ran fine, as though nothing had happened.
Poking around, one muffler was swollen, the other side burst, and the cap & rotor looked like they'd been in a fireworks show.