just puy on 6 coil packs and change the sparks plugs on 2002 honda accord v6 and it's still miss fire what can be the problem.

 

A misfire can also be caused buy issues with the fuel system or the health of the engine cylinders, lack of compression. Are you getting a check engine light, if you are, what code are you getting? P0300, P0301, P0302.....etc etc. If you are able to scan the computer and retrieve any codes they may be able to point you in the right direction.

If you do not see a check engine light, nor have any diagnostic codes. Then the next step would be to do a compression test on each cylinder and also test your fuel pressure, fuel injector operation.