When I brought it in his orginal assesment was that the connecters werent firing the cylinders so I replaced them all. the problem returned in less than a week he then placed it on a computer and gave it back to me a day later as fine. but within a week the problem return. Thats why I want to get a mechanic that knows Z's to help me past this prolem but one that I could just go to for future issues if need be. but I will check out FaQ its just that I am not mechanically inclined nor do I with to experiment with my Z.