Update: replaced the lower intake gasket since I had one and cleaned a lot of the deposits out of the intake runners. Moved one injector to bank 1 from 2 and moved cyl 5 injector (misfiring cyl) to cyl 6. And, replaced the PCV. Misfire code is gone but I still have the bank 2 too lean code (P0174). Tomorrow after work I will snoop around with propane to see if I can detect any leaks. If that doesn't work I will swap all injectors from one bank to the other. | 
