4.0 knock

Yesterday I was driving back down to Jersey after I spent thanksgiving with my family. While I was there, I also took the jeep to get emissions tested (required in CT until the vehicles 25 years old... my '99 is almost exempt...) but it ended up failing due to an evap leak and an o2 sensor. I...

Good morning guys, Hoping someone here has encountered this problem and had a reasonable solution. It would not let me upload full video so hoping that with what is provided someone can have enough for input. It’s a consistent constant knocking sometimes it quiets a bit but still there.