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my nitemare begun with the check engine lite . o2 sensor stuck high .I found gas seapage around o2 sensor and #7 exhaust port . replaced 02 and # 7 injector (stuck open dripping when removed) . engine ran good ,low power and knocking noise. Remove left head inspect valves,all seating and all straight. Removed pan and found #7 rod bent. replaced piston and rod. Reassemble with NEW OEM cam phasers ,chain guides,chain adjusters and timing solenoids. still runs rough low power.I then replaced remaining injectors. still the same. Received code PO174 system too lean bank 2 . Compression test was good from 160 to 170 psi.Ther is a slight poping through the air cleaner after running 20 mins. Also i hooked up a vacuum guage and the reading would not stay steady . meaning a mechanical problem. i rechecked the cam timing twice ,it's right on. Also I have battery voltage at the timing solenoids ,both wires. Any help would be gratefully appreciated .I am lost at this point . Thanks Hoser