I did a smoke test nothing came out of the intake, I started getting p0171 & p0174 after I changed post cat o2 sensor on bank 2. After I did vcg bank 2 lean went away just p0171 persists. I’ve replaced the idle control valve , valve cover & gasket, took throttle and cleaned it, I’ve deleted the Ccv, I’ve replaced the vac line from fpr to intake boot , I did have wet oily spark plugs which I cleaned out along with coils and seemed to work no more misfires. I’m stumped on what’s going on with this thing.