Before any adjustments are made, it’s essential to verify that the ignition and engine management system are operating properly. Bill used a Snap-On Scanner to interface with the ECM and check for trouble codes. If a scanner is not available, jumping A-B on the ALDL connector will allow the Check Engine light to flash any stored problems. Remember, neither the scanner nor the ECM will be able to verify the condition of the ignition components. For this, you’ll need an oscilloscope, or you’ll have to replace them with new parts.