A few months ago I bought a 2000 Outback (4 cylinder) with 70k from a friend's parents. They work out of the country and drove it infrequently, but are the type to stay on top of scheduled maintenance.   I drove about 2000 trouble-free miles including some longer road-trips. Then, a few days ago I went on a road-trip and when I arrived in Vegas (hot, middle of day -- not sure if this is a factor) the engine started cutting out on the freeway. Seemed to be worse under load (hill) and the pow