P0174 P0171

[COBRA#3452]

I have a 1997 cobra with

bassani o/r x pipe
mac catback
steeda timing adjuster
4:30 gears

the codes have been coming up for months now. i took it to the shop and they put in new intake gaskets, fuel pump, fuel pump relay, ccr module, iac valve, and mass air flow sensor.

i replaced both o2 sensors and cat sensors and the light still comes on.
the car idles low and will stall sometimes. any help would be great

 

[sgarlic]

For both your codes (which I'm sure you are aware, mean you're too lean discovered by bank 1 and bank 2)

Things to check listed in the book:

Excessive or low fuel pressure, leaking/contaminated fuel injectors, leaking fuel pressure regulator, air leaks after the MAF, vacuum leaks, pcv system, improperly seated oil dipstick, leaky egr gasket, stuck egr valve, leaking diaphragm, oil overfill, cam timing, cylinder compression, exhaust leaks before or after the pre-cat o2's.