I have a 2013 Range Rover sport V8. Noticed that there is a knocking noise at every start regardless of being hot or cold. After running it for a couple of miles, the noise goes away but comes back after a shut off and restart. Took it to the shop where I was told it was the tensioners. $2000 later, tensioners and guide were replaced, and timing chain was checked. Still the same problem persists. Then I was told it was the flaps inside the intake manifold. Had that checked and they are fine. The car has 92000 Miles on it. Any Ideas?