Makes no sense to have a flashing CEL but no codes. Do you know if the OBD reader was able to establish communications? You should try this again, maybe at a different shop, and make sure the reader being used is able to establish communications.
Living in the woods, mice can be even more of a problem. Have you checked the air filter box? They love to make a nest there, and it could be big enough to severely reduce incoming air. And yes, take another look at the plugs and wires as well.