help Shaking at idle (Sometimes Stalls) - Misfire all cylinders

[SuperFastYo]

Hello all,

   Hoping you can help me pinpoint the issue. My 2018 A4 started shaking at idle a bit ago, when pulling codes I had misfires on all cylinders. The car will drive just fine, doesn't feel like there's any loss of power. At idle when it starts to shake I can put it in park or neutral and rev it to 4k RPM and then the issue goes away for a little bit. 

   Because of this I started my google search to see if anyone could point me in the right direction before I start pulling apart and replacing stuff. Someone said if there's a vacuum or pressure when removing the oil cap it could be the Oil Separator, so I changed that out. Nothing changed.... I moved to the Coil Packs and Spark Plugs... Still no change. 

   I'm at a bit of a loss, I was thinking of doing the injectors, & since the intake manifold would be off clean up the carbon build up and replace the water pump (Ive gotten the code for it randomly a few times but it never stays). I really rather not spend all that money if there's a more common cause that could be the issue that I just haven't considered. Does anyone have any input on this?

Edited 13 hours ago by SuperFastYo