The number of subjects covered in this thread is inevitable when the problem of juddering is so elusive! Virtually every bit of work, no matter how large or small *temporarily relieves* the juddering, yet without fail it always returns. The amount of detail everyone here has been over is astounding, and frustrating that no definitive results have been returned. I don't think my hoses have ever been replaced in the 252k miles (wen past quarter of a million a couple of weeks back, yay!) yet the problem is still there, although the intercooler cleaning is on my list of things to do. I can't really complain though, considering I bought this car for £200, + £200 parts to get it to good condition.
ps. check your fuel line near the tank for corrosion - very common fault and lets copious amounts of air into the line.