My automatic transmission 2000 subaru outback stalls when i brake at intersections.

Car: Subaru, Outback, 2000 - Back to Fix-It - Subaru Repair Manuals

Q.My automatic transmission 2000 subaru outback stalls when i brake at intersections. I had my transmission rebuilt last year, and recently had a tune up.

I already checked/done: tune-up, new fuel filter

Answer This is a common symptom of a faulty torque converter lockup solenoid. While cruising at speed the torque converter in the front of your automatic transmission makes a 1:1 contact ratio for maximum fuel efficiency. As that solenoid gains buildup from use, it holds the fluid locked in the solenoid, and will stall the car at stops just like if you were driving a manual car and forgot to engage the clutch.

Addition How much does it usually cost to have this fixed? Is it part of the transmission?

Answer yes it is, further hands on diagnosis is required to determine the exact cause, but most likely its a faulty torque converter lockup solenoid and not the torque converter itself.
This fix is not major transmission surgury and can usually be done in an hour or so, but shop to shop prices will vary, if it is the torque converter itself however a new torque converter will be needed and that can be costly.
The torque converter sits inbetween the engine and the transmission. There are two turbine like fans inside, one attached to the engine and one to the transmission. As the engine turns it spins the fan which pushes fluid into the transmission fan, making it turn. This is made so if the car is at a stop and the transmission fan doesnt turn (the brakes hold it still) but the engine can still spin freely. The torque converter lockup clutch, locks these two fans together using a paper clutch in the front of the converter, this way when your at speed the one fan doesnt spin slower than the other, wasting gas mileage. This clutch is engaged using hydrolics, and what seems to be your problem, is that the clutch is not pulling away and letting the fans spin at different speeds. When the car is turned off however, pressure on the clutch subsides as the oil pump is no longer working, and the fluid is forced back into the transmission.
To fix a faulty converter, it invovles removing the transmission from the vehicle, and can be quite costly, but in your case i would put my money on the solenoid.

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My automatic transmission 2000 subaru outback stalls when i brake at intersections.