Alright here’s a photo I took at work since today the truck is making all kinds of noises from exhaust.
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The exhaust is a single pipe that splits before rear axle with a tube muffler of some sort and maybe a cat? Not sure I’ll get a pic. And here’s two videos of the noises is was making and the surging idle. It runs fine cold but once it’s warm js starts to surge and the exhaust pops are right after startup, if you blip the throttle it stops. It may also be running rich a little bit since it was burning my eyes standing behind it videoing.
Here’s the tachometer surging
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And here’s the exhaust clip, at around 1 minute I turn the truck off and start it back and after the idle comes back down (1200 when I started around 500-550 when the popping starts)
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I don’t know if this is possibly a sensor ? Plugs? I’m out of ideas on it but when it’s cold the idle doesn’t get down low enough to make the noise and the truck runs fine, once it’s warm and it fires up instantly the idle drops and it’s running weird. I moved the truck earlier at work and when I was in reverse the truck was making more of a backfire noise, it was a more aggressive popping than in the video provided.