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fuel pulsation damper

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on my 00 Si i keep getting P0133 codes (slow O2 response) the O2 tests good but my only question is that is the pulsation damper on the fuel rail adjustable cause the car runs rich all the time? the car idles fine but when on the e-way the rpms tend to flucsuate ever so slightly. please only respond if U know what your talkin about thanks

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