V8's seem to be notorious for head gasket failure which would probably give the symptoms. This is a DIY repair, but it's a lot of work. There are some good YouTube videos showing the process if this is the case....

Sounds like an air leak somewhere...check for condition of turbo hoses etc.

I've joined to look at other member's posts regarding suspension faults on Discovery3 and 4 and Range Rover Sport, which I own. I seem to get an intermittent fault as have other people. My front struts are quite noisy when going over speed bumps etc., so I think they need changing. I intend to...