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This one for me was failing fuel injectors. This is something you can buy online and fix in about 30 min in your driveway. Dealers try to charge labor for each injector. Independent shops will often only charge a 1/2 hour of labor to install. Repair cost at a dealer $800 dollars for all 4 Aftermarket shop ~~ $600 for all 4 Backyard ~~ under 400 and a 1/2 hour of work. Junkyard - Avoid. These dry out over time.
This is a common problem. I just had the repair done at Midas. It was roughly $140 to have the valve cover and all of the plug rings reseated. Unexpectedly oil consumption also went down with the repair.