1990 Taurus won't start

I am working on a 90 Taurus for a friend. 70,000 miles with a 4cyl engine. The engine cranks over just fine, but it won't start. My limited knowledge on a Taurus is the fuel pump in the gas tank, which in this case I do not think is the problem. The ignition module which I replaced, did not help. I checked the coil. There is no spark coming out of it to the plugs, There is power from the battery to the coil however. I replaced the coil and still have the same problem. Does anyone know what else I should be checking? Thanks.