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hey guys i have a 1994 gt with 5.0 car fires right up,idles great and runs without sputtering but when you get on the gas it seems too lack any type of hp!! just seems like it should have more power than im getting...ran the obd-1 tester to it and came back with codes #172 o2 sensor fault/lean and #176 o2 sensor fault/always lean..and insufficient tp change during no o2 sensor switch? could someone translate! what do i need to try...upgrades on the car include 373 gear X pipe with flowmaster cat back, cold air intake, aluminum drive shaft, chip, and short throw shiffter....car ran the same before the extras where put on...so the chip really made no performance change.
 

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well you answered your own question, the sensor is faulty thus unable to put enough fuel to the engine, fix the o2 sensor and then you wont have a lean issue anymore.
 

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if its got alot of miles replace the o2s and the fuel pump
clean fuel injectors and fuel filter while your at it, plus a new K&N air filter always helps.
 
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