I used some NGK plugs that i bought at repco... lol. They werent expensive plugs about 30$ for the set, thats all i know. Also, i should probrably add that this problem really only started happening when my car hadn't been started for a week. So im really thinking it could be something to do with the battery. I think bennjamin might be right.. Ill get around too changing the battery then see how it goes.