Thank you for the detailed follow up. I attached a photo of my engine sticker. I did notice that it came up as MTD on some sites, but it is a Kohler. My model does not have the fuel pump, but does have the carb spacer (picture attached) I din't replace the spacer or the gasket that is between the spacer and the engine manifold. Everything seems pretty tight, but I will try to order that gasket and hope that is where there is air getting in. I also just put a new air filter in and inspected the air intake housing and don't see any cracks, deformation, or damage to the plastic housing.
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