Hello, long time dreamer now an owner....

Hello to you all. As above I've wanted a Landover for as long as I can remember and now I have one. I've gone for the P38 4.0 V8 1995. But we have an issue. Obviously. Haha. My new toy has been putting like a kitten, well until she has warmed up a then she coughs and stall. Cools down and will It restart. But then warms up and dies again. It's fault coding camshaft position sensor. So have changed said part and was all looking good but no. Warms up and dies. Can hold the revs at 3000 and it's fine but as soon as I let them drop it does again. It has had a replacement engine which has done about 25,000 miles so I'm a little bit flabaghasted by this. Any help is greatly appreciated.