Originally Posted by Kazoocruiser

I'm about to light up some medical cannabis and see what information i can glean regarding your issue from the One who visits in the smoke.

Is there any chance you could record / post a video with the truck making the noise so it would help pinpoint what the problem might be?

Here is a test you could do. With the engine running and making the noise, you could pull one spark plug wire at a time. If the noise quits on a particular cylinder when you pull the plug, that is your problem cylinder.

You could also just let the engine idle until it gets warm, and see if the noise goes away, instead of shutting it off and restarting it.