Stalling!!

Hi All, 

I'm really enjoying my membership, there are some really interesting threads to follow - great stuff. 

I have a newly acquired 2010 Legacy 2.5i SEn which, although I absolutely love, I'm afraid to say it's causing me some grief!! 

It has begun to stall!! 

From cold the car will start and run beautifully, it will pull away smoothly however, if I have to stop (before the engine is fully up to operating temperature) the engine will stall. 

I can restart the car with no problem and once operating temperature has been reached the car runs beautifully. 

Any thoughts, help or advice would be gratefully appreciated 

Kind regards 

David