2003 bmw 325i 6 cylinder p0174(system too lean bank 2)

I have a 2003 bmw 325i with bank 2 lean code so far I swapped bank 1 and 2 upstream o2 sensors to see if it would change and didn’t. I smoked test the intake to find intake leaks I found 2 one for secondary air, fixed that and for the brake booster and fixed that and it’s still too lean. Pulled plugs out and all are evenly lean across all 6 cylinders. Checked fuel pressure I have 50 psi while running at the rail. Did have a code for secondary air injection when I had a broken vacuum line that goes to the check valve but fixed that and code went away. Cleaned MAF no change. My short term fuel trim at idle, bank 1- 7-11% and bank 2- 19-24% it also rough idles so I’m kinda stumped!