Olds Silhouette 95 intermediately stalling out after service engine light on

What is your question?

Car sounded like popcorn popping but ran great with no check engine lights. We changed the waterpump, tested the altenator, and changed the balancer. After this the car did not make noise anymore but started stalling intermittently (say after 10miles)as if heating up and dying yet not heating up, with service engine soon light. The light said ignition module. The ignition module tested 20+ times and read good. Then once again read cam sensor. Changed cam sensor. Then once again light came on. Then changed all three coils. Still after 10 miles it stalls out and engine light on. We are chasing our tails and mechanics are helping us chase it. Any ideas from anyone out there???? Help, we are desperate. Last fall we changed the computer(brain), cam sensor and mass airflow sensor also. This car is killing me and its my only way of transportation.