cutting out on idle???

[CBurns]

I've had my g40 for just over a month and am loving every minute of it however, i do have one problem which is bugging me.

The car runs fine when the choke is on but when the car has heated up and say your sitting at lights the car cuts out.

I notice that just before it cuts out the air fuel gauge shows nothing as if there is no fuel?????

Does anyone have any ideas what this could be any help with this would be great as it's the only thing that annoys me about the car!!