I had the same prob with my 8v.Whilst going on holiday and driving at a steady 80mph,when i came off the gas and then went back on-the car would jerk .
It was very :(ing.
When i got home i was told to put 98ron fuel in,as i had allways run it on normal unleaded 95 ron-this along with some fuel cleaners seemed to do the trick.
BUT.....a problem i have is that at low speeds in say traffic,if you come off the accelorator too quick and go back on,the car seems to jerk forward and backward.
I have been round the houses with this and changed every thing you can think of-fuel injectors,ecu,throtlebody,all electrics..the list goes on and on.But the problem still persists.
I went back to my local indipendant vw garage and after a test drive the so called expert told me that is how mk2's drive!!!!!
M8v has done 150k,but i still drives great apart rom this other prob.
Mind you my old passat GT with the same engine 'pb' has done 200,00 and runs like a new motor (apart from leaking power steering and wheel bearing)and this old passat does not JERK at all....
sometimes you will have to hold your hands up and except that you can get a mystery fault that will cost you more
and hair loss than the car is worth.
STILL COUNT YOUR BLESSINGS,YOU COULD OWN A FORD OR VAUXHALL
:-[
