Hi
Check if the hose that connects to the throttle body is tight enough and not sucking in air which may cause the engine to be sluggish and loose the vacuum pressure.
Hi Waynet
Sorry to hear your troubles.Most Nissan diesel DCi engines experience that.What I ve learnt over years owning and learnt over my DIY service and repairs,the ANNOYING RATTLE sound is coming from the injectors not anywhere in the engine. It seems from my experience Nissan never advised...