how many miles do you have?

DTC P0301-P0304 are cylinder misfires.

on 97 civics (except HX models) there is a service bulletin (99-011) that covers replacement of a faulty ECM that causes these codes to be thrown, but with no driveability problem.

emissions extended warranty covers this for 14 years / 150,000 miles.

if you have any fuel/emission related problems with a 95 accord V6, or any 96-97 honda (excl. passport) bring it to the dealer. they'll fix it for free.