where and what is the coil pack on a 04 GMC Sierra 2500HD?

[Ellek S]

what a where is the coil pack on a 2004 gmc sierra 2500hd

 

[STi]

A coil pack, also called an ignition coil, turns 12v from your battery into thousands of volts for your spark plugs. Therefore it's usually on top of the spark plug, or close to it.

http://www.ehow.com/how_4509346_replace-ignition-coil-gmc-sierra.html

 

[hirev13]

follow the spark plug wire from the spark plug to the coil
about 8 - 10 inches away
you should have 8 of them

 

[hirev13]

follow the spark plug wire from the sparkplug to the coil
it's about 8 to 10 inches away
you should have 8 coils
one for each spark plug