I have a 2014 5.3 as well. I have had this issue happen 3 times. Every time i bring it to the dealership they tell me its the same problem. They replace the cap for the cylinder that is misfiring. Its under warranty, but I know there is an underlying issue that they are not resolving hoping to just get it through the warranty. The truck has less than 20k miles. Luckily I have a trusty tacoma as a work truck. I have been a chevy guy all of my life, but I am disappointed and will most likely trade it soon.
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