Good question, Rich. By having egt probes in all cylinders and using one ignition module at a time, you should be able to pinpoint a spark plug that might be miss firing. Also if one ignition module fails you should note a rise in egt's in all cylinders. It might also be able to show a difference in performance between carburetors. It appears all that is necessary to do this is add the probes and wiring. Stay tuned.