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I have an 05 GTS. I recently had plugs replaced and mass flow sensor and 02 sensors. After the engine warms up, the idle fluctuates up and down when in neutral. If the temperature is below freezing the check engine light will not come on. If the temperature is above 50 and above the check engine light will come on after about an hour or engine run time. Please help
 

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We can help much more effectively if you get the code number. Also the FSM is organized by code number for diagnosis procedure.
 

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Reading from my Haynes Techbook OBD-2.. The codes you provided

P0171..System to lean (bank1)
P0431..Warm-up catalyst efficiency below threshold (bank2)
P0174..System to lean (bank2)
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42414

)
 

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Your ecu cannot provide enough fuel to the engine. Check to make sure the upstream O2 sensors are the ones you replaced, not the downstream ones. These cars have a lot of sensors depending on the year and engine.

If those are good, make sure your injectors are all functioning by listening to them. If they are clicking, check your fuel pressure and fuel pressure regulator.
 
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