need help fast! 92 sundance duster v6 willnt start!

i have a 1992 plymouth sundance duster 3.0 v6. the car will not start. it rolls over but willnt start.the lights and everything else work. there is no spark from the disterbutor i had the car checked and the guy said it needs a new ecm but i just replaced it and it still willnt start. if anyone knows y i would be very greatfull if you could tell me the problem with my car.