my fiesta rst has a problem when u start the car up it is fine sometimes but then all of a sudden it drop below 1000 rpm splutter and loses its power and the car wont rev up properly. when i am driving the car it does not feel like the turbo is coming in and u can hear it spluttering from the exhaust then it will cut out sometimes can anybody help me please i have fitted a new fuel pump and sender but has not cured it