What you said about the fuel trims has thrown me off the scent too.
With trims showing fuel being removed I was looking for things that would be making it rich, so never suspected an air leak.
Who knows there may still be other things yet but, I do know I cant leave it leaking.
Will keep this thread updated as things progress.
Once I get this out of the way I'm thinking about pulling the KTM apart over winter, new thread
6k is quite the bill to suck up, but quite a lot of work pulling that and sorting out broken studs etc.
Is that the norm for Land rovers?