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2003 Cadillac DeVille Question: check engine alert flashes on and off. what could be problem?

 

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handlemaker, Spicer, MN, October 17, 2012, 21:16
 Rookie

alert came on solid and went off then came on and off and flashes. engine runs rough at idle. could this be serious? having it checked tomorrow. anything to be alarmed about?

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