strange problem!!!!!! violent judder!!!!

[A80Avant]

today i went for test again and i realized that the problem had vanished!
change through gears was completelly normal and responce was immediate.

Is it right to think that if the ECU has detected a leak it may take some time after you have resolved it to get back together?Bacause i have done nothing from yesterday mechanically and the tap on the vaccum line that was damaged was taken care and it still performed with judder.

Anyway,it can always be something else as well,so i will keep an eye to it...