When I go to start my car it won’t start or turn over but I’m hearing this noise that you can hear from the video and I’m wondering what it is can someone help please
I attached a video of what noise the car is making
update I got the car to start but I can’t go over 2.5k rpms and the car is idling really rough and also my tcs light and slip light came on

 

Sounds like a classic case of crankshaft and/or camshaft position sensors. Replace with OEM only and not aftermarket.

 

so I’ve replaced it maybe about 2-3 months ago but when it was faulty back then it would let me go over the 2500 rpm’s

 

I'm gonna go out on a limb here and say it may be your alternator, only reason I'm saying that is because your Z does have a slight crank at the start if the video, giving us the idea that the starter clicks and turns, however will not hold any power to start the car completely, your battery health also shows this, even though a good battery would real 12+ volts, 350z for some reason really require the battery to reach the line on the gauge, this also shows the alternator not charging up the battery, if you are able to start the car, using a jump starter or other methods, there are ways to test the alternator either with a multimeter, or at AutoZone or other auto parts stores. Here is a link to 1A Auto to help you understand
link: title: "Car or Truck Won't Start? Difference Between a Crank No-Start vs. Just Won't Turn Over"
hope you figure out the issue.

 

Did you use OEM sensors or aftermarket?

 

I used OEM

 

So I got my alternator and battery tested although my alternator tested fine my battery tested bad but when he had the cables on it, it wouldn’t start so do you think it could be my starter

 

It depends on how bad the battery is, if it leaked any acid, or may have a bad cell, then a jump starter may have no good use, corrosion would also cause the car to not have as much of a good connection. Only reason why I say your starter may be fine is because we can actively here the *click* sound, as well as the spinning of the flywheel, crankshaft & belt. The starter will most likely be located under the passenger side of the engine bay (mine is). I would recommend getting your codes checked anyways, as a faulty ignition shouldn't cause high rpm.

 

Update:
I ended up fixing the problem and it was my starter! I put a new one in and my car started up right away and has been running smoothly thank you for all you guys help.

 

thats great man, did you get the codes checked aswell? is the rpm back to normal?