Hiya, glad you've got it sorted. You have saved me a lot of trouble as mine was misfiring/only running on 3 cylinders after it was serviced..... I had new 071's too so this morning i swapped the plug from one cylinder to another and the problem followed the plug. So hopefully new plugs will sort. Could you let me know what ngk's you used please??? I think someone mentioned on another thread that there were some dodgy 071's around at the mo.