Thank you very much mga Bros. for the replies

Things I have already checked/done on my engine
>Umaabot ang gas sa combustion chamber dahil amoy gas when I crank with the plugs disconnected
>battery charge and clamps are ok
>fuses are all ok
>CEL lights on for 5 secs after turning on the ignition and goes off after 5 seconds.
>no spark present in HT wires leading to the plugs, pinalitan na ang coil but di pa rin umistart kaya ibinalik na lang ang lumang coil.

Gusto ko sanang i-check ulit yung primary and secondary winding ng coil but I dont know how (internal kasi yung coil and hindi ako familiar sa terminals), can somebody tell me how to do it? TIA