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Check for plumbing leaks between turbo and intake manifold. Maf to turbo. Bypass valve and crankcase vent.
Just about any intake leak will cause an issue.
On mine I had the same issue. Found that I wired the maf plug looking at it backwards. Switched the wires around and it fixed the issue. Then when I swapped to my Greddy turbo it did it again when I missed the bypass valve.
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