Hey I’m a 16 year old and I just got my 2008 g35, it has 130k miles and runs good but I have been hearing this noise from under the hood ( only when the hood is open) it kinda of sounds like a rattling noise, I hope y’all can hear it, it worsens after I turn off the a/c. Could this be a bad a/c compressor pulley? You can hear it more towards the end of the video, also does the engine sound healthy?
I put a start up video (it was filmed 2 starts after cleaning the throttle bodies)

 

 

Take off the AC belt, start the car, does the sound go away? If so then spin the pulley by hand and see if it's smooth and quiet. The tensioner pulley is probably shot by 130k miles but the main AC pulley isn't usually a wear item.

 

could a loose tensioner pulley cause a rough start? Listen to this and lmk, the sound kind of went away
Also the belt feels tight I haven’t tried to take it off yet

 

You should replace the plugs with OEM ones. No telling what condition they're in.

Pull them first to inspect but likely they're shot and need replacement.

 

will do tomorrow, I’ll post them.

 

Anyone can recommend a spark plug brand for a 2008 g35, I heard ngk makes good ones

 

well damn I guess the people before me really didn’t give a **** about the car💀