You are right about code 41 and 91 they are 02 related. They (both sides)are both reading Lean for extended periods of time or not switching normally. Look for any kind of vacuum leaks, manifold gasket leaks, even fuel restrictions, plugged fuel filter, lines etc... Fuel pump can be getting weak, alot of things can cause lean conditions, hard to diagnose it from my comp
Code 33 has to deal with your EVP/EGR system. this could indicate your egr not seating properly or simply your EVP (sensor mounted on top of your EGR valve) not functioning, check EGR vacuum lines aswell.
Yeah I think I have a vacuum leak coming directly into the upper intake. I have a hose that connects my cobra upper to what appears to be a charcoal canister. I have been told I can remove that and cap it off, thus closing that vacuum leak. Is this true??