I am finding my octavia has devoloped a new fault, That when i start the car after a trip it starts and runs like its on 3 cylinders it makes terrible rattling noise and then stalls, When i start the car again its normal ?? Dont know if its anything to do with my turbo as i think it has stick vains which i will look at asap.

Sticky vanes in the turbo won't cause that type of rattle / 3 cylinder action.

Maybe a sticky injector, or a dodgy sensor. Can you get the fault code read?

Its not causing a fault code