The O2 sensors removed were along next to the catalytic converters that were removed. Midas removed them thinking it would trigger issues because of using leaded fuel. I think my best bet is to get some O2 sensors, since they left the holes there for them. I recently found out there is a Nissan dealership here, so I "think" they may be able to fix the issue using some new O2 sensors that would be hooked into the electrical system. Do you think this might be the solution?
Will check spare tire pressure, but how is that relevant to the exhaust?