For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition
65 WarningSpark Plug Replacement Engine Control
Removal ProcedureRemove the ignition coil(s). Refer toIgnition Coil Replacement - Bank 1and/orIgnition Coil Replacement - Bank 2.Warning:Refer toSafety Glasses and Compressed Air Warning.Caution:Clean the spark plug recess area before removing the sparkplug. Failure to do so could result in engine d ...