Engine died while running - 97 Ranger
I was driving my '97 Ranger (2.3L, 4-cylinder, automatic) on the interstate, and the engine just lost power. I couldn't accelerate or keep my speed, so I coasted to stop on the shoulder. I tried to start it later a few times but it wouldn't start (it only kind of started just once--it seemed to be at half power, then it died again 10 seconds later). It should still have just under half a tank of gas. Does this sound like a battery or an alternator problem? I just changed the battery three weeks ago. I still had my headlights and my interior lights.
I greatly appreciate help.