1 check that the base bolts are nice and snug, and that adapter bolts are tight,
![pssssss :psss:](https://board.marlincrawler.com/Smileys/marlin/psss.gif)
i used RTV on mine
2 pretty much all of it
3 when you toss the egr valve crap it leaves a port for your pcv to attach to if you have the egr blockoff with the hose connector