What would cause a loud rattling under car when idling & foot is off the clutch? on 2003 Nissan 350Z

When the car is in neutral and my foot is off the clutch there is a loud rattling from under the car, once the clutch is engaged the noise stops. The noise is progressively getting worse and much more frequent. Nissan service department cannot seem to identify the problem. Please help me.

Asked by for the 2003 Nissan 350Z
Sounds like the throw out bearing is bad in your clutch. You need to get it repaired as soon as possible. Eventually, it will shatter and you wont be going anywhere. Find your local auto repair shop ASAP. Goodluck