How do you tune up 2004 gmc envoy?

To tune up a 2004 GMC Envoy, start by replacing the spark plugs and ignition wires, as these can degrade over time and affect performance. Change the engine oil and filter to ensure optimal lubrication. Additionally, inspect and replace the air filter and fuel filter if necessary. Finally, check the fluid levels (coolant, Transmission Fluid, brake fluid) and top them off as needed.