2000 Dodge Stratus engine rotates but does not start

Electrical problem
2000 Dodge Stratus 4 cyl Automatic

I just bought my car and a month later it died at a light, my wife started it again put it in drive and died again. No start, I changed the spark plugs and wires and it starts. Then she drives to gas station turns it off and it wont turn back on. I check and theres no spark to the plugs, replace plugs and wires again, nothing; replace coil, still nothing. I check and there is voltage going through the wiring attatched to the coil. Could this be my cam or crankshaft sensor? If so how do I test them? Any answers would be greatly appreciated.