P0174 System too Lean (Bank 2)
P0171 System too Lean (Bank 1)
P1744 TCC (Torque Converter Clutch solenoid)/Escessive Slip Detected
The first two codes indicate air/fuel ratio is correcting rich for an overly lean condition. The possible causes for these codes to appear are as follows :
fuel system malfunction
EGR system malfunction
air intake or vacuum system leak
engine oil level too high
incorrect cam timing
restricted air cleaner
faulty PCV system
excessive internal engine wear
With the symptoms you are experiencing I would start by cleaning the EGR related components as well as either cleaning or replacing the EGR valve. This is also the most common component to fail and cause these codes to appear and will cause poor fuel mileage as well.
The transmission code is for a faulty TCC solenoid or faulty wiring to the TCC which is why you are experiencing the hard shifting.
Let me know if you need further assistance.
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Saturday, February 28th, 2009 AT 6:45 PM