Just curious: Have you checked the ignition timing?

"airboatman" <mbgodfre@rockwellcollins.com> wrote
> I have a honda accord lx 4cyl vtec that has 70k miles. It is missing
> pretty bad. The check engine light is on and flashing sometimes. The
> codes set are 71 (random misfire) and sometimes 72,73,74. I suspected
> ignition so changed in sequence the coil, rotor, distributor cap, plug
> wires, plugs, ICM and then the distributor assembly (with cam position
> sensor) none of the changes made any difference. I have also checked
> valve adjustment, compression and pinched the return fuel line and
> listened for changes. I have listened to the injectors with
> stethescope and they are consistent. I pulled the fuel pump from the
> tank and checked for screen clogged etc. None of the above has led
> anywhere. I don't know what to try next. Help!