Detailed Hummer H3 Spark Plug Change (also Chevy Colorado & GMC Canyon). Also, Air Filter Change.

Changing the spark plugs is an easy DIY project that can save you a significant amount of money over having a mechanic do it. It'll take less than 30 minutes and you'll spend under $40 even using premium extended-life iridium plugs. Compare that to a shop which typically runs $250 to $300!

ACDelco 41-103 Professional Iridium Spark Plugs: https://amzn.to/34YEDH3
Titan 3 Piece Magnetic Parts Tray Set: https://amzn.to/2SSBUcs
DeWalt impact wrench https://amzn.to/34eRLaG
Permatex Dielectric Grease: https://amzn.to/3dqTCgM