my disco 97 auto losses power on hills orif i overtake at speed the computer showed the no4 injector was faulti so i replased it but this has not helped still the same can any one help

Get an M3

better still - an M47!

Ok Ill try and help.Have you checked your turbo hoses.Take bent pipe off on turbo get a mirror and check turbo blades are ok.Start engine and hold hand near turbo ,you should get blast of air from it.[dont put your fingers in there].Put bent pipe back on nice and tight.Rev engine and squeeze turbo hoses ,they should go hard.If they are still soft your not getting any air pressure in the inlet.Check for splits or replace all hoses like I did.And make sure air/fuel filters are clean.They are not fast cars though so dont expect to much.