diesil

I was accelerating from a roundabout and my X5 3.0l diesil and it sounded as if it was bouncing off the rev limiter at 4000 rpm. It has since done this at 3500 rpm. This morning it would only rev to 3500 rpm initially, then it would hit 4000 rpm, sitting on my drive. the acceleration seems ok...

Hopefully someone can help with the below a little ond winded but i will try to make it as short as possible. I filled my car up last week with diesiel within 1 mile of leaving the petrol station the car just died on me. I have had the fuel tested was all ok Fuel pump tested was all ok fuel...