I listened to your video, that sounds awesome. That is one thing about my truck. It sounds like it has a vacuum leak somewhere. I took it to this mechanic and he put a new gasket on something, cant remember what, it wasn't a valve cover gasket, but it fixed the problem temporarily but now it is back and the engine makes loud hissing noises which sounds like what you ran into, I will definitely look into doing this over Christmas break.
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