2000 blazer codes po174 amd p1153 idles and runs rough

Question

Checked maf and o2 plus plugs wires

Answer 1

P0174 Fuel trim lean Bank 2

P1153 H02S  Insufficient switching Bank 2 Sensor 1

Both these code points to the same area at Bank 2, inspecting that area for items that can cause a lean condition which can be from split vacuum hose , or a EGR that is stuck open or its gasket, Vacuum leaks are the main concern when looking for a lean code condition. and this includes the intake manifold gasket.