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lean fuel mixtures

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Hi guys my car has started to run lean all of a sudden and cant figure out why 

Would valve lash do this the tune hasnt changed 

I Did alter the idle screw to lower idle which would make u think less air rather than more air . idle is set to open loop with idle stepper 

I have not changed the lash either  

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If tune is the same then you are looking for anything outside the ECU that can effect the amount of fuel getting to the engine.

Fuel pressure and flow, Injector flow fuel rail blockages etc.

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