ECM code P0153

Bi directional scan tool currently shows DTC P0153. Freeze frame data is as follows : fuel sys 1: clsd )(calc load %29.4 )(STFT 1- 0.8)(LTFT 1 - 10.9)(STFT 2 2.3)(LTFT 2-10.2)(engine speed 1888)(mph speed 36)(coolant temperature 194). Engine idle is rough under load or in park or drive. Intermittently tries to stall when not in motion then recovers to a normal idle. Previously it was showing a lean DTC P0174. Changed DPFE sensor. And the purge canister hose from intake to canister and added fuel injection cleaner and high octane fuel and lean condition has cleared on scan tool after showing pending I'm thinking the lean condition was a dirty injector on bank 2. As of recent when in driver seat in vehicle cabin with the engine in drive and depressing brake pedal heard what sounds like a vacuum leak under dash which leads me to the brake booster as possible culprit May be the check valve or booster itself or the seal on cabin side possible leak I need to smoke test both exhaust and engine for leaks and check vacuum to the booster for how much vacuum its showing. Any advice in direction with the scan tool freeze data results and possible culprit(s) I don't want to condemn the o2 sensor just yet. It that may be one villain in the group . Thanks in advance.