Question about 2004 Chevrolet Impala

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My epica is miss firing on cylnder 5 as well.

It all started a month ago, hesitating poor fuel economy. replaced plugs and oil. solved problem temperarily but it slowly came back.
replacing coil pack tomorrow, hopfully solve problem.

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  • Chevrolet Master
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Why or how did you determine 5 is being evil? Check for any vacuum leaks, any air leaks in the intake ducting, and chab=nge the MAF sensor. All will affwct the air fuel ratio. _ good luck, Ned

Posted on Jun 15, 2009

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