gesus

sounds like what happened to mine, blew a spark plug out, terrible noise sounded like exhaust had come off, if it's only running on 5/6 cyls, at idle there will be a noticible wobble to the engine vibration, which as you know should be smooth, if it is can be fixed with head in place, if that is the problem, can be fixed with head in place for a fraction of removing, just make sure mechanic knows what he's doing, cost me £110, running smooth again