GM Service Manual Online
For 1990-2009 cars only
  1. Inspect the spark plug gap. Adjust the gap as needed.
  2. Inspect the spark plug wires for any obvious cuts, burns, or damage. Replace the wires as needed.
  3. With the engine ON, inspect for any arcing to ground or other components. Replace the spark plug wires as needed.
  4. Check the spark plug wires for proper resistance. Refer to Spark Plug Wire Resistance .