Where do you find the spark plugs in a 2003 Chevy Tahoe?

The spark plugs in a 2003 Chevy Tahoe are located on top of the engine, under the plastic engine covers. To access them, you'll need to remove the covers. The exact location will depend slightly on the engine (4.8L, 5.3L, or 6.0L). They'll be arranged in a V-shape, following the cylinder arrangement of the engine. A repair manual specific to your Tahoe's engine will provide diagrams and precise locations. You should consult such a manual before attempting this repair as some components might need to be removed or moved for access.