Overall car drives fine no concerns when abused it's like a scalded cat! However, on a sensible driving day, once up at cruising speeds 60/70mph and settled into the cruise (no cruise control in use), when light power is requested car stumbles and gives hesitance / vibration, push the pedal further to kick down point and a gear is dropped and away it pulls. It does not present itself in DS mode A possible imaginary fault though it does give concern..... My thoughts are mixed & looking for pointers? Initially thought about swirl flaps, gunked manifold etc though flaps are inactive below 2000rpm () the Rev range of this troubles seems to be circa 1400-1800rpm. Is that where the first turbo spools ? Maf sensor fault ? Dpf / Egr I'll plug Carly in though don't think I'll get error codes, does that mean my thoughts are imaginary? Anyone experience similar, is it a trait of the twin turbo engine?