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Could be a few things like, bad oil separator, leak in your secondary air injection system, bad air injection valve, Bad electric vaccum pump. Im still hunting down my issue but im living with it for now... I have to buy presents and hold off on the car repair.
With me, it comes and it goes, its never an all day thing and its never an every day thing. I do notice when i hear this Psst noise that its more challenging to change gears smoothly without jerking the car back and forth during shifts.
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