How to Change Chevy LT1 Coil and Ignition Control Module

You may need to check your ignition coil and ignition control module (ICM) on a LT1 or LT4 if your car or truck is hard to start, runs rough at high RPMs, or idles unevenly. *** Buy genuine AC Delco ICM: http://amzn.to/2cTQiyV *** These can also be caused by low fuel pressure, bad injectors, or other ignition components (Optispark, plugs, wires). Shown on a B-body Impala SS (Caprice). A similar coil design is used on the 4.3 V6, 5.0 305 V8, and 454 V8 throughout the 90s.