http://www.classiccarauto.com/impala/how_to/images/distributor.png
1,8,4,3,6,5,7,2.
What year and what engine?
The spark plug wiring diagram for a 1994 Chevy Cavalier can be found in a service manual. The manual might be available at your library, or can be bought from most any auto parts store.
spark plug wire setup spark plug wire setup
You won't need a diagram if you change one spark plug wire at a time.
Which engine??
Could be a faulty spark plug or spark plug wire.
only use AC Delco plugs, there the only one with the correct heat range.
The number 1 plug wire on a 454 Chevy engine typically connects to the spark plug located in the front-left (driver's side) cylinder. You can refer to the firing order diagram for your specific engine to ensure the correct placement of the plug wire.
The 1993 GMC spark plug wire distributor wire placement diagram can be obtained from most General Motors dealerships. Most auto-parts stores will have the diagram.
What engine and what year?
That is the rubber boot that is on the end of the spark plug wire that goes onto the spark plug.