Q: air sound on acceleration

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Hi After HP increase 40+ (stage 1), i have installed a diverter valve with yellow spring , i usually get vacuum leak error code (p0171 bank 1 system too lean) .. And when i accelerate i hear air sound, i wonder if the spring i use not strong enough which air escapes?

Thanks Kadri

My car has 114000 miles.
My car has a manual transmission.

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