Air lock in coolant system (with engine cold and shut off, remove
coolant filler cap (fill to water level if required) then squeeze bottom radiator hose several times until no air bubbles come from the place you filled with water.
Spark Plugs - change (accordingly based upon stock heat range or colder if you are doing certain upgrades)
Coolant - flush and change (every 120) MAF - Inspect and Clean if needed Thermostat -(change if indicated; see notes above) Air filter - change or clean (see notes above) Fuel Filter - change and inspect entire fuel system Oil Fill
Cap - check for leaking, install OEM Oil
Filler Cap Rubber Gasket if needed