Ok so i have TWO lean codes. they are PO174, PO171. and they only started showing up after i put my cold air intake on. i cleaned the MAFS they stopped for a long time and there back again. Now this is were it gets odd. Only ONE code will pop up. some times its the bank one other times its bank 2. witch i find odd, And if i clear them they will show up anywhere from 50-150ks some times longer some time shorter and only show up when i stomp on it. SO i was think maybe could be an intake gasket or it could be in the cold air intake its self. Any ideas? and the codes RARELY show-up both to gather, one or the other and the odd time both will.