Now, what is the ICM?
Also, sometimes if you put your foot on the accelerator it will run for a second or two. Then it will cut off. It may backfire as well.
I remember reading in the Haynes book that when you put in the new ECM, you have to put in the MEM-CAL/PROM in the new ECM a certain way or it will be destroyed when you crank the car up. If that is destroyed, what would happen? Would the car not start then?