How you start diagnosing issues instead of throwing money at what you think the problem is.
Start by pulling your spark plugs and checking their condition.
Measure the resistance of your spark plug wires and individual coils.
You can verify the spark itself by pulling the spark plug out, placing it in the plug wire and placing the electrode end near a bare metal surface. (Note: remove fuel injection fuse before starting this test)
Google for 2006 Honda Civic Service Manuals. Download the manual and follow the steps provided.
