N16 Nissan Almera P0171 check engine code

Hello πŸ‘‹

A few days ago I went to start my 2004 1.5 N16 Nissan Almera early in the morning (though mild temperature) - It usually starts right away, but it struggled, and took 4-5 times to get a weak start (sounding similar to a low battery, so I presumed it was that as I usually only do short runs).

A few hours into the drive, a check engine light shows up, I also notice that the drive has taken significantly more petrol than normal.

Reading the code, it's a P0171 system too lean.

I've read the live data, and the mass airflow sensor is reading ~0.2g/s with the engine off, ~2-3g/s idle, and ~7g/s at 2500rpm - So I don't _think_ this is the problem.

The long term fuel trim is pegged at 26.6% at idle, and the same at 2500rpm.

I've also felt around for any vacuum leaks and there's nothing obvious, though I've not tried any carb cleaner etc.

When the car is idling, and I rev up to 2500rpm and release, the car _almost_ stalls every time - The revs dropping low, and some small shudders.

I want to avoid throwing too many new parts - So do you have any advice on what could be wrong here, or the best way to identify what's wrong?

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