runs rough

1996 pontiac grand prix,  car is hard to start, with this an intermittment problem, the other
day it was very hard to start and while driving home, car died, It would restart (difficult) and
was running very rough, like timing was off, when placed in drive, car would die. Ended up
call tow truck. The check engine light is Not on, with the only dashlight lit being low
coolant which comes on and off since having a new radiator installed