Try running Chevron premium gas. Eight years ago I had a similar problem with a different make vehicle. It ran fine but would throw "multiple misfire" codes every few months. I was running Costco gas when the codes lit the check engine light. Since running the Chevron premium, which has techron, no check engine lights in 8 years. That was my shops recommendation and it worked. Also, you need to take freeway runs and don't dog it around town. Enjoy the sound of 5 cylinders above 3k. Merry Christmas!
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