No spark?

I have a 92 taurus that runs fine for 10-15 minutes and then dies it wont start for about and hour or so. I replaced the Coil, and ICM and still same problem. When it dies it loses the spark coming from the coil, the car never has been overheated, but I can let the car sit there and idle all day long and it wont quit. I am frustrated with this car please help. No check engine lights have ever came on, only light that comes on is the oil light when idle, I raise the rpms and it gos out, but the oil level is where is supposed to be.

Its the 3.8 litre engine, I have replaced the ignition coil and the ICM for this car it is mounted under the cowl on the firewall