I just installed a LS6 intake and some headers on my car and got this code (map/baro circuit low imput). Also got the EGR flow sensor A circuit low imput at well. The EGR was removed for the LS6 intake so I know I'm good there. But the Map/baro circuit I'm not positive about. I would assume it's just a sensor I didn't plug in since the code was worded with the same low circuit imput. Could be wrong but just wanted to get some imput. Pretty sure I did leave a connecter unplugged somewhere in the back of the manifold. MAP sensor is Manifold Air Pressure correct?

 

yup that connector behind the intake was for the map sensor, and then you have the cam sensor and the oil pressure sensor