Spark plug wire integrity is vital for proper engine operation.
A thorough inspection will be necessary to accurately identify conditions
   that may affect engine operation. Inspect for the following conditions: 
- Correct routing of the spark plug wires--Incorrect routing
may cause cross-firing. 
 
- Any signs of cracks or splits in the wires.
 
- Inspect each boot for the following conditions:
 
If corrosion, carbon tracking or arcing are indicated on a spark plug
wire boot or on a terminal, replace the wire and the component connected to
   the wire.