Car shut down while driving

Ford topaz 1993, 4 door, 165,000 km.
while driving the car will sputter, loose power, eventually shut down.
If you allow 15 minutes along the side of the road, it will restart, and good to go until this sputter, shut down thing happens.

temperature guage is showing low to medium temp, the fan does turn on and off.
there is fluid in the rad,
It sounds like electrical?

there are no engine lights on when this happens.

HELP