I have a 2004 Mk11 xr6t which has done 88,000km. For the las couple of months the car has been shuddering at times. I can never pick when it is going to happen or what brings it out, but it becomes quite violent at times. It is a very quick vibration shudder. I have had a wheel alignment done, had new tyres put on and changed the front break pads and rotors. I took it to Ford three times and they didn't figure out what it was (didn't seem to try very hard really) and to two other mechanics. If anyone has had a similar experience I would greatly appreciate your feedback. Thanks