Hi...I own a 2002 TD5 Defender 110,000m. I have a on going problem that develops when the car is put under load eg negotiating a long gradual hill where apon the car loses power & runs rough untill returning back to the flat where it returns to normal after a few miles ! I've taken into my mechanic who connected to the dionostics which showed no faults how ever we did discover the air flow meter was at fault which was dually changed but the fault continues ! Any ideas ?...Thanks Russell