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my check engine light came on so took it to local autozne and came up with code p0171 probable causes are o2 sensor bank one, ignition misfire or injector problem so i have changed out o2 sensor and converter, fuel filter put some fuel treatment but so far still the check engine comes back on. It runs real good when it get going but sometimes does stutter by the way its a 2001 chevy s10 with a 2.2 engine any advice will be appreciated
 

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Here is the flow chart, that is the problem with autozone, they sell you an O2S because you have an O2 code, but that is usually not the system at fault. You need to be checking for vacuum leaks and fuel pressure issues.

 

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Kinda random on Identifix, sorry, not much help there, a few filters and wiring issues, one or two ECTs.
 
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