It appears to be, although I do have a spare computer that I might try. It is just a little rich, it passes fine on NOx. For now I rejetted the carb and I’m just waiting for the testing stations to open back up.I suspect among other things the emissions computer in mine is not working correctly. The EGR system does odd things, and there are other symptoms that are more or less in line with the computer. IS yours working properly?