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2005 CTS 3.6
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That is strange, I never did receive any errors on any of the coils after replacing them.
Also for all 6 coils to have errors p0351-p0356 seems more like a sensor error. Engine runs smooth and idles great! I read somewhere that dirty oxygen sensors could produce this, will look into cleaning them more.

I also let the eBay seller know I was having trouble, I remember someone had issues with a few and the eBay seller sent out some new ones, problem solved.


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Same thing is happening to me I just order 3 new coils off of rock auto replaced them myself because I was misfiring in 3 cylinders after changing the spark plugs. Now I have the same codes coming up. How did you fix it?
 
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