I have the same problem!!!!!!! I replaced all of my plugs and wires MYSELF and still have the sputtering!!!! I have looked at all wires and plugs twice over and they are fine. Looking into possible TPS and Coil Pack issues as well.

 

Hi CST, I was just reading your and the other posts about the spark plug situation...my 2010 Equinox is exhibiting the same behavior.
By chance, can you forward the letter that you received from GM about this situation?
I have changed the #1 plug and wire twice now and it is still skipping under acceleration occasionally. I would love to get it fixed for good but don't feel it should be a customer responsibility. Can you help?
Thanks!

 

2010 nox is a completely different engine and build than the 2008. Nothing from the 2008 tsb applies to your vehicle. the only thing they share is a nameplate.