Some carmakers endorse changing the ignition coils at scheduled intervals; this program need to be followed to reduce the likelihood of failure. Faulty ignition cables can cause the exact same complications as undesirable spark plugs. For this reason, your mechanic should also check the ignition cables when changing spark plugs. https://24-hour-car-key-replaceme08271.bloggactif.com/27591222/facts-about-2004-pontiac-grand-am-ignition-switch-replacement-revealed