Trying to diagnose what this could be. I want to fix it but don't have tons of money to chase the wrong fixes. I'm thinking timing belt but wonder if it's the belt plus other components and if so which ones?

I uploaded a 1 minute video to YouTube to show the issue.
https://youtu.be/Ot8_R_C26xM?si=bk8eqQPG_sSlKAqj

 

What we working on?

 

I'm trying to diagnose what the most likely culprit for the loud noise is in when my pilot is idling. I posted a link to a 1 minute long youtube video.