Originally posted by hetfield:
P0171 System Too Lean - Bank No. 1.
P0174 System Too Lean - Bank No. 2.
Having both of these codes at once probably means that you have a vacuum leak. It usually ends up that you have to replace the UIM gasket. The two gaskets themselves run around $30-40. If you are mechanically inclined, you can probably do the work in a few hours.
Check the following:
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=189516
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=164455
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=21820
You can probably find a lot more threads if you use the search and/or archive search features.
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
| 
