Engine Stall problems of the 2003 BMW 330

2003 BMW 330i, I have an issue where the engine stalls when the coasting to a stop, or sitting stationary, and with the clutch fully depressed. Engine also exhibits uneven/odd acceleration behavior, often lagging noticeably at speed. I've had the car at the dealer to diagnose the problem on 4 occasions in the past year (19k miles) with zero resolution. Because the car isn't throwing an error codes, I guess that I have to just "live with it". Not acceptable. This can be a dangerous issue, especially when coasting to a stop. I would like to see BMW finally step up to the plate and address this issue. I just shouldn't have to live with something like this, in this day in age, and with a mass-produced car.