Trouble code P0174

[rickrod3]

I have been working on this for a few weeks and would appreciate if I could run this past you guys. Originally I was getting P0151, P0154, P0158,& P0174 After working on the truck doing the work below and sealing the resonator to the throttle body with a little RVT (new resonator $200.00) The MIL light does not come on but the P0174 does not go away.
So far I have replaced the fuel filter cleaned the mass air flow sensor, Checked the mass air flow sensor with a scan tool as per my Haynes repair manual.
I bought a scan tool and am learning how to use it here is a scan that I did today.
Number of DTCs stored in this ECU 0
Fuel system 1 statusOL
Fuel System 2 statusOL
Calculated LOAD Value(%)2.4
Engine Coolant Temperature(¡£C)89
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)16.4
Short Term Fuel Trim -Bank 2(%)0.0
Long Term Fuel Trim - Bank 2(%)25.0
Intake Manifold Absolute Pressure(kPa)30.0
Engine RPM(rpm) 628
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)23.0
Intake Air Temperature(¡£C)24
Air Flow Rate from Mass Air Flow(g/s)5.51
Absolute Throttle Position(%)0.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.025
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.050
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.420
Short Term Fuel Trim Bank 2-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.930
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedNot OBD
Power Take Off(PTO) StatusOFF
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I'm thinking I have some kind of vacuum leak. If you all concur What is the easiest way to smoke test?

Thanks in advance
Rick