Wardy thank you for sending me the link, i have read this and makes sence..........
However, i happened to be working on the car this morning and thought i would get the old HKS plugs out and give them a damn good wire brushing!
Well i chucked them in and kept the new cheep ones just in case and lo n behold i took her out past the 4 thou, past the 4.5 thou and even past 5 thou without any problems at all ecept for one.......
Me n the little lady ran out of road but we managed a good 145 out of the beast.
i will keep in mind all that you have sent thank you