What is the firing order on distributor cap of a 1995 GMC Yukon with 5.7 liter engine?

The firing order for a 1995 GMC Yukon with a 5.7L Vortec engine is 1-8-7-2-6-5-4-3. This is consistent across the various 5.7L Vortec engines of that era. However, always double-check your specific engine's markings and/or consult your owner's manual to be absolutely sure. The firing order is usually cast into the engine block or stamped on a tag somewhere in the engine bay.