2002 Pontiac Grand Am Trying to find answers

2002 PONTIAC GRAND AM
140,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MR.DOYLE
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My mother has a 2002 Pontiac Gand Am it has 140000 miles on it and the service engine light just came on. I had it on a computer and it says it's miss firing. My question is could it be the coil packs cause it has new wires and plugs?
Nov 25, 2009 at 1:13 PM
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