Video - Help! Is this IMS? What's up with this engine?

[Jager]

The idle bounce could be a number of things but I would get the throttle body cleaned first then test for vacuum leaks.

The rattle could just be chain tensioners.

I have no direct experience with IMS bearing failure but you will have a significant leak on the underside of the motor, then at some later point in time there will be nasty grinding sound just before the motor chews itself to pieces.