C3 Tick over problem

[legins]

Hi everyone The problem im having is annoying car starts ok and runs great however when after 10 mins or so and i come to a stop the idle seems to drop right off and the oil light flashes and the car beeps 3 times but no engine management light comes on When i pull away the car runs great until i come to a stop again etc etc All help appreciated many thanks for reading

[legins]

Forgot to add my car is a C3 on a 52 plate 1.4 petrol