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maf placement issue, maf too close turbo or too close to filter or inadequate straight pipe inline with maf, or maf is dirty, or there is a leak near the maf. Or the recirculation is buffeting the maf hotwire, too close to maf. If the turbo upgraded the volume of air excessive for stock size or location recirculation.
Otherwise, look for dropping fuel pressure and watch wideband. Rich wideband = maf issue. Lean wideband = leaking air or fuel pressure or clogged injectors or something with fuel
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