EVERY TIME THAT I DRIVE MY CAR I FEEL THE MISSFIRE OVER 40 TO 60MPH,I CHECK EVERYTHING.ACTUALLY I REPLACE THE SP. PLUGS CAP,ROTOR,WIRES AND I PULL THIS CODES PO300,PO302,AND 304.I SWITCH INJECTORS TWICE ,CHECK FUEL PRESSURE ,MAP SENSOR AND I DID VALVE ADJUST.AM RUNNING OUT OF IDEAS. ANY SUG.

 

your fuel regulator maybe at faulty

 

take your car to the Honda dealer, it should be be covered under emission warranty, I think there's a service bulletin on this misfire code, it's a replacement of the ECU(PCM). so take it there and the should run a DCS on it.