They have driven and admit to the problem but they have no idea what it could be. It accellerates fine, if I floor it it does not judder at all. It only judders (Sometimes quite violently) if I hold the accellerator at a specific point.
I have been reading around the net and found a few other people having similar problems. One person said it was a cracked spark plug cable, two others said that in the gear box they use rivets instead of bolts and the rivets broke off and messed up the gear box. There are people saying that you should check X, Y and Z sensor, check the cam belt and a whole host of other things.
What should I do?