93 keep Wrangler stalls, smoke

93 keep Wrangler, just purchased. Driving
for a while, the a shudder, then engine shut
off. Turned it back on, drive a bit, happened
again, started again and stalled in the
driveway where smoke was coming out
from under the hood. I couldn't look at it
then. Now, a week later, it starts up and
runs, can't find any leaks, oil okay but
coolant was almost out. Could it just have
been overheating? I don't want to take it
out and get stuck, as I am thinking it
couldn't be that easy. As I said, just got it
with little info. Ideas?