WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
Measure the resistance of the all spark plug leads.
Check the cap and coating for cracks.
Measure the resistance.
Limit: 19 kΩ
Fig 1: Measuring Resistance Between Spark Plug Leads