Odd idle and P0171 and P1170 codes

[dave-]

Car has been E85 and turbo'd for a few years now and been trouble free. For quite some time there has been a slightly poor cold start which I disregarded, was previously always 2nd crank start without fail (even super cold days). Car is regularly tracked and probably not had too easy a life but all in all, reliable. It does have ID7xx or ID8xx something injectors. All hardware and tune has been unchanged for 2+ years.

On the weekend, cold start idle seemed to get slightly worse and threw CEL for both P0171 and P1170 while cruising at highway speeds. Cleared/restarted and car still drove ok at the time. Ended up doing another 50km/30miles without it coming back, cruising the entire way and no heavy throttle applications. Am I on the right track thinking the codes are related to an intake/exhaust leak?

Have checked as much of the intake and exhaust that is accessible and think I have a slight leak on cylinder 1 collector slip joint before it merges to turbo housing noting some minor condensation run marks down the tube. No idea how I'm gonna seal that and nothing obvious intake and have tried another MAF already.

Regarding the idle though, would that be related to these codes or something else? I figured the cold start wouldn't be impacted as its closed loop and the leaks wouldn't come into play until open loop operation?

Videos shows inside/outside at the same time, sorry about upside down mode, stupid gopro but you can see after the initial start, it holds cold start RPM but hunts down quite a bit before settling. What should I be looking for?

Disconnecting the battery to clear trims doesn't show any negligible difference on the idle front either.

Haven't driven the car much since as I'm pretty sure the TOB is about to disintegrate, noisy as all hell on any touch of the clutch now so will need to pull the gearbox and suss that out too. I do have a tactrix so could do some logging if it would assist though I don't know what I'm looking at.

[ame]https://www.youtube.com/watch?v=chRnqx5a7FE[/ame]
[ame]https://www.youtube.com/watch?v=HefzjxznZps[/ame]