Engine stop on idle at red light or in traffic jam.

No, the car was rebuilt after an accident in the back(few dammage), and warranty has been cut, but the problem don't come from that accident

Unless the car was considered totaled , I would fight that decision with Subaru and ins. co.!

The problem is the car is stalling not the warranty... When i bought it i knew there was no warranty, it's been more than a year that the car is running well, except the past two weeks that it's stalling on red light or in traffic jam after one minute on idle with feet on brake pedal.

Okay , forget the warranty , my bad , but as for the stall , no re-start issue , probably the only way that will be diagnosed , besides guessing on 'most likely' parts , is by having someone riding along on a test drive while monitoring 'live data'. To me , though , it sounds like a problem in the 'idle control' circuit possibly a poor connection at a harness connector or an intermittently sticking idle air control valve (back to the 'guessing ' part).