Just got done installing CMCV delete plates and updating the tune.

Edit: Nevermind - just rechecked the codes: P0171 and P0174 ... LEAN!

I know to check all my connections, but is there any chance that the intake mani isn't torqued down just right? I did follow proper sequence. Suggestions on what to check?

 

I would recheck all connection. Retorque manifold and check intake. If it's all good then there is possibly something wrong with the tune. I would call who ever sent you the tune.