I have the exact same problem, as i come to a stop light my rpm's will tend to drop to around 350 ish and most of the time will stall. its happend about 12 times, i have had the truck for 3 months and only had 60,000 km's on it. it runs awesome at high speeds. very very rough idle when at a stop light and at low speeds. had it serviced at the dealer they cleaned the throttle body, and replaced the mast air sensor and tht didnt resolve the problem it still stalls. any idea?