ALL gasoline engines have spark plugs. Only diesels don't have spark plugs.
It is a 3.1 Liter V6, so it has 6 spark plugs.
A/C Delco #41-103, these will idle better than other brands. Also good, NGK, or Denso, stay away from Bosch, and any platinum plugs.
They are in the sides of the head where the exhaust manifolds are.
Change the spark plugs at 100,000 miles. 03 still has a serviceable fuel filter and that can be changed too. For all the answers about these trucks join our enthusiasts forum at www.trailvoy.com
A 2003 Chevy Suburban will crank but not start if it has no spark or fuel. Checking for a clogged fuel filter or fouled spark plugs can help to resolve the problem.
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To change the spark plugs in a 2003 Trailblazer, first, ensure the engine is cool and disconnect the negative battery cable. Remove the air intake duct for better access, then locate the spark plug wires or ignition coils; disconnect them carefully. Use a spark plug socket and ratchet to unscrew the old plugs, and replace them with new ones, ensuring they are gapped correctly. Reassemble by reconnecting the ignition components and the air intake duct, then reconnect the battery.
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They will normally last at least 75,000 + miles. Check your owners manual.