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Message: <blockquote data-quote="2011reptar" data-source="post: 2074922" data-attributes="member: 75991">Thanks for all the info and suggestions to everyone who replied.Today I replaced the upstream 02 sensors, and the remaining 4 injectors as well as soaked the cylinders with sea foam. It smoked up a lot of carbon, but still runs the same.Following the compression test, I did use a bore scope and the cylinders look good, still has a lot of cross hatching. I actually got lucky and had shut the engine off right when a valve was open so I got to see it as well and it’s the same as the piston head, a little dirty but no pitting or damage.At this point, the only thing left could be a weak valve spring that isn’t broken yet, a slightly bent valve, or the ecu itself. When I had the valve cover off, everything including the cam looked basically new. I’m pretty tried and broke from the parts cannon the last week or so, so I’m just gonna roll with it for now as much as I hate to.If it truly is just carbon, the seafoam in the oil should take care of that in another 100 miles or so.I’ll keep the thread updated if anything changes. I’ll also look into a tune to raise the rpm, could just be the can profile after 110k miles, I have no idea. I am getting about 12mpg city and 18mpg highway, and it’ll chirp new 35” K02s in 2nd gear, so I’m gonna cross my fingers and hope for the best for now.</blockquote>