Car makes almost like a racket type of noise when I idle but when I push the clutch in it stops. It has been doing this for a long time, and sometimes it id very loud. Is there a fix to this or no?

 

Regards Jhanes062:
Very likely the transmission input shaft bearings. It's fairly common to the 350Z. Sometimes referred to as sounding like gravel in a can. If so (emphasize), not a matter of immediate concern.

Peace,

 

Stock flywheel or lightweight/aftermarket?

 

I’m not exactly sure I just bought the car like that but I’ve been seeing everywhere that it happens a lot with these cars

 

Timetel's comment above is on point Cement mixer sound is only related to the clutch in that stepping on it puts enough pressure on the input shaft to dampen the vibration. Like pushing on a loose, buzzing cup/bottle in a loose cup holder to keep it quiet.

Worse on HR/VHR cars but exists in all 33 and 34s.