u/Flipitagainpls

Hi, I'm having this issue with this 2009 Volkswagen Jetta 2.5 liter.
It starts like so, I enter the highway and I speed up between 80 - 90 mph.

I drive for a little bit, and now we're in traffic.
I slow down, and it downshifts really hard almost nocking me back a little bit.

Now I'm stopped and when I start driving again. The RPM is really high, and the engine sounds SUPER strong and then when I past about 50 RPM it nocks back really hard and it shoots down to 30 RPM.

This has been happening for months and even the mechanics are a bit confused.
Has anyone else had this issue?

Here's the video: Video (I'm not sure how else to post it on here, my apologies.)