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The check engine light had come on several times a few weeks. Took into dealer and the computer told them there were misfires on a cylinder. They tried to replicate but could not get it to do it. Took the car back home and over this past weekend check engine light came on several more times. Back into the dealer it went, now they say it has a sticking valve and they need to take engine a part to fix. Has anyone else had this happen to them.

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It happened to my 3.6 on my Malibu, the exhaust valve.
CTS V6's had notoriously bad coils not covered under warranty
 
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