Jimmy-Faw

Hello all, i am new to the Skoda world and have had my vrs mk 2 remapped by a company in Lincolnshire. My car judders when i try to use any of the extra power given and is now starting to judder most of the time. i have been to numerous garages who have done some work and looked around and they have done work to take off the previous codes - turbo pressure fault/ manifold flap 1 sticking- however there are currently no codes and the car still judders. I work down south so when i go back up north i will take it to the garage who remapped it. I was just wondering if anyone on here could shed some light on the situation and point me in the right direction. many thanks jim