i35 revving noise problem. Anyone know what causes this?

[anime891]

I've had this problem ever since I bought the car. It didn't bug me at first but now it's just irritating and I want to get it fixed asap. Fortunately I was able to find videos online about the same problem but I have yet to figure out a fix or what is causing the problem. Here's the videos:

https://www.youtube.com/watch?v=G2egQZ0vG7M

https://www.youtube.com/watch?v=R1sC2Jk-rP4

[maxhopper]

How many miles on the car?
How is the oil level?
What oil are you using?

[Tothe02MaxSE]

IM having that same noise in my 02 Maxima.
Has 150k
Anyone have this issue?

[maxiiiboy]

Re. the 1st video: The engine is moving too much, I would check the engine mounts. I bet at least one of them is bad.
Re. the 2nd video: This noise sounds like something caused by the timing chain, or timing chain tensioner.