spark plug

ok well I just changed my spark plugs, rotor and cap...It was having a fireback kinda feeling when I let the clucth go and and gas go.. I just test drived it and it runs alot better no fireback as of yet....Well here is the dilemna I found oil on one on the plugs and wires anyone know the problem. Seems costly....

help please any suggestions will be appreciated


Thanx in advance