Hi this car is getting to be a headache. It lost all power about 6 months ago for a day. Feels like turbo has failed put foot down it still goes but like a tractor for acceleration. Have cleaned fuel system disconnected the MAS to see if that would improve nothing. Problem was intermittent I.E if went over 80 MPH you would feel a slump in power and would remain like that till you stopped and restarted engine. It has been serviced regular. Now though it drives ok but got no vooomph please help