3.8 coilpacks

Got called back to the office this afternoon because a computer was
rebooting. The 1994 Trans Sport 3.8 ran beautifully. I shut ijt off,
and when I came out half an hour later and restarted it I smelled raw
gas from the now cold exhaust, and the engine had a pronounced miss.

I limped it home and disconnected injectors one at a time ntill I
found #3 made no difference. I shut it off and pulled #3 plug wire.
When I cranked it over there was no spark.
I pulled the wire from the coil. Still no spark. I pulled #6 from the
coil (opposite connection) and it had LOTS of fire.
I pulled the coilpack and replaced it - lots of fire, but the engine
still missed. Spark tester showed the second (middle) coil pack was
producing a weaker than normal spark - so I replaced it too, and the
engine now runs as sweet as ever.

Any idea what would cause 2 coils to "go south" all at once?
The other coil pack was replaced something like 5 years and 90,000 km
ago. (thruck has over 365,000km on it now)

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