boost is now working properly but when on full throttle it feels like it keeps letting on and off the power and sometimes bacl firing. then when i stopped the car turned itself off :-( ever since i gpt the new actuator fitted? what could that be?
perhaps you have boost leak or misfire.. quite hard to tell from symtoms youve giving..
it may be worth your while to run it over to have plugs, base timing and pipework checked out. theres all manner of things that can cause that sort of running.