hi i have got a landrover defender 110 sw 12 seater when going up hills it loses power very quickly on straights it is perfect i can get about 60 to 70 mph, on a hill it drops to about 30 mph the turbo is ok it starts fine does not smoke at all the bloke i brought it from had driven it around on cooking oil so i change the fuel filter but that didnt cure it any suggestions would be very appreciated thanks