This is genuinely confusing me, the first half of the video is of it idling, it then began to surge out of nowhere, this is all after I changed the fuel filter, added howes additive and used diesel 911 to ungel the fuel last week, it actually ran relatively well after doing that and then today it began to surge again.

The second video is of me starting it after leaving it alone for 1.5 hours (30°F), notice how it behaves when attempting to start Failing IP? Lift pump failure? Air in the lines? I'm not sure anymore, this is driving me insane, i don't know anymore, any help would seriously go a long way.

Video: https://www.reddit.com/r/Diesel/s/tkmbTC6sbC


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UPDATE: So we actually took it to the on base DIY shop and did a smoke test, there was a indeed a bolt missing on my turbo which we fixed immediately, but the surge was not remedied. I took it out for a test drive and when i rolled up (letting off the throttle) it began to surge again.

Missing bolt on Turbo: https://photos.app.goo.gl/iYM9csxDiYaNyAw56

Surge at idle: https://photos.app.goo.gl/G3vtcf6rsojggC4g7

Hard start (took 7 tries): https://photos.app.goo.gl/UshScC3UKLt8p5EN8 https://photos.app.goo.gl/Ahb3dKVVzBVuZA1f9

I definitely have a faster time getting up to speed, but the surge is still there, a friend of mine who does own a 6.2 is adamant it's a failing IP, but I've been told that it could be the Lift and/or Fuel pump, but I don't know anymore, I'm about to throw in the towel here. If it is an IP, it's going to be an expensive repair, im just an E3, don't necessarily have all the funds in the world