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ok what are you doing when you have checked the problems with the plugs are you replacing them or cleaning them ??? and another obvious thing they are the right plugs ??????? cause if the problem has been solved by your checks the plugs won't clean themselves not in the short time you are running it. I'm not good at spelling the way i speak so don't get upset i just wanna help ya and find your problem so it don't happen to me , so if my questions are not helping just ignore me . I mean no harm here