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Hoping some friendly and knowledgeable folks out there can help me. I have a 2012 Outback with a 3.6 liter H6 engine and the check engine light is on. I drove it to an auto parts store to read the code and it came back as all six cylinders misfiring! A little history here - I purchased the car used from a dealership in Florida one year ago with 70,000 miles on it. While driving it down to WI, I noticed a brief, but fast vibration coming from the engine between 3rd and 4th gear, usually when the car was under load. The engine would also hesitate when accelerating, especially up hills, but usually only did this when it was cold. I had it checked by a Subaru dealer and they thought MAYBE it was a failing torque converter? and gave me a pretty high estimate for shop costs on a hunch. I did some research online and decided to replace plugs, tube seals, and valve cover gaskets and have the fuel injection system cleaned. It took care of the problem for a few weeks, but now the problems are back and bad as ever. When the CEL came on, I was expecting to see a code for one cylinder misfiring, but it came back with a misfire code for all 6. Makes me think it's not the ignition coils, but something potentially worse... I would REALLY appreciate advice on ways to diagnose this issue. I really like this car and can't afford a new one!