P174 is System too lean (Bank 2). There is a TSB 01-9-7 which outlines the following for P0174.

I have a hardcopy printed. Don't know if the link still works.

http://www.v8sho.com/SHO/TSB0197HO2SServiceTips.htm

If the link doesn't work, try http://www.v8sho.com/SHO
and then scoll down for the TSB

Good luck

"Always do the cheap and easy ones first." 1996 V6 ATX 96K miles