2009 GMC Sierra Runs Rough and Backfires

Just finished the 3 day Hybrid/EV course. Excellent course. As a technician of 34 years I found the knowledge of the instructors and the hands on training helpful. Highly recommend this course to any shop that may have customers with a Hybrid or EV vehicle.

Absolutely one of the best diagnostician in the industry. Mark and Jordan really know what to do. If you need automotive diagnosis, call Mark.