ok ,where do i start,advice plz,,freelander td4 05,,every time the standard maff plug is connected ,,getting no performance,black smoke,,changed the maff to a pierburg maff with a roverron tuning module ,and got the same results,due to the same results either way ,ive placed the standard bosch maff back in and disconnected the tuning module,ive disconnected the maff plug all together and the car is perfectly drivable,,but its obviously not right ,