Popping on idle

[Salteen]

I have an issue where my truck is popping when it idles. No other time. It sounds like a stuck valve but I cant really tell. It started with my new header installed but it's too loud to be a normal pop it's like its hitting the valve cover or something. I will post up a video on YT and yall can listen.

[Salteen]

Here is the video. It pops quite a few times as I am walking beside the truck and getting in and before I take off. It pops alot and idk if it's actually a stuck valve or just the header. It happened right after the header but idk if the cats were blocking out the sound??? Idk but the clutch really slips the fuel pump is noisy and it still runs. I would like to figure this out though.

[Salteen]

https://youtu.be/KW2OzWWPDd0

[claych]

? vid is with an 'open' header?

[claych]

^^
??? hello ???