Тройная бабушка чероки на катушке зажигания 1999 года

That such a good day, I have problems with my Grand Cherokee Laredo 1999 truck with a 4.0 -cylinder engine online., The problem is that it is pulling, it trembles a lot, this went to root that I change spark plugs, this engine model does not bring wiring to the spark plug Sparking, as if I were short of the coil, but I already revicts and clean and assure me that everything is perfectly well connected and still sparkled the spark plug, my doubt is whether the Катушка уже оценивает или не может быть подходящими, или вы хотите, чтобы независимый шорт, и я влияю на нее на систему зажигания ... Помогите Favo, если кто -то знает об этом, ...