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EP3 - EML PO172

For several months I’ve intermittently been getting an EML (P0172 system too rich bank 1).
The only issue it appears to cause is the car won’t idle and stalls at junctions etc.

If I clear the code , start the car and leave it running for 10 mins to re-learn idle , it’s then ok until it happens again. It is now happening more often.
Only other issue is a slight hesitation when accelerating from low revs. Not sure if this is related?
Would like to pinpoint the issue but get lots of possibilities when looking up code.
can anybody shed some light?
Car is an EP3