Any one else having this check engine light?

[H3 Alaska]

All 3 (mine/wife/brother in law) of ours have had a check engine light in the last 2 weeks.

Wife: P300 engine misfire
Mine: P302 engine misfire
Brother in law: who knows (whole other story)

Mine only happens after the "low fuel" indicator comes on. ??????????
Once I fill up the tank, it goes off.
The wifes goes off and on at random.
All have less than 10K, but more than 8K miles.

Wife's is going in for cylinder head replacement today.

f5stop? Any suggestions?

Regards,
Dan