Thanks D7Zul for inviting me. Hmm...actually it does work but ONLY for 20V! NOT for 16V!.
This method will batch fire spark plug at once. During my testing, I can drove for 1 hour until the engine stall by itself (I think it is becoz poor grounding on extra spark plug).
Then I managed to made a second version without using extra spark plug. Engine can be started normally, but I did not test drive it coz I don't dare to take a risk engine stall during cruising.
Most forumers from clug4ag successful with this COP modification.
Another important thing is distributor position must close to 10 deg position, else it will create back fire from throttle. That what has happend to me.