The Automotive Training Group 2013 GM Engine Performance 7-hour course andTraining Manual covers all of the newest GM technology, but emphasizes evolving failure patterns on older systems as well. The information provided allows the technician to quickly differentiate between electronic and mechanical issues plaguing the GM models most likely to come into the shop. Misfire, Fuel Trim, valve seat issues, cam timing faults and cylinder-kill system failures can all cause similar symptoms and codes; but the training helps the technicians differentiate betwee them and diagnoise the root cause of the problem.