Firing order for 2005 Chevy Uplander?

The firing order for the 2005 Chevy Uplander, which is equipped with a V6 engine, is 1-2-3-4-5-6. The engine's cylinders are numbered from front to back, with cylinder 1 being at the front on the driver's side. For proper ignition timing and engine performance, it's important to follow this firing order when working on the ignition system.