Every so often my SES light will go off and ill take it to get checked and its always a missfire, and they tell me its a bad wire or bad plug, well i've replaced the plugs twice and it continues to do this, as far as i know there isn't any wire to replace on the 2.4, any ideas ?

There may not be wires but there are still boots. They are only like 5 bucks at most parts stores. When I replaced mine they where cracked and burnt. You can always check them for cracks or excessive burning.

thanks ill do that

If not the plugs, the next step up are the fuel injectors.

i had the same problem as well, my #2 cylinder was misfiring, checked all the fuel supply stuff, nothing, changed plugs and boots, still nothing. Finally i changed out the IDI cover with a different coil set and it ran perfectly! Try that! I just had an extra coil set laying around!