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A bad vacuum line could also cause fuel cut but you didn't mention it happening at approximately 4,000 rpms (?) so it might not be the one that goes to the Wastegate.
My '86 hits fuel cut @ ~ 4k rpms in 4th @ WOT and Clarks Garage mentions a vacuum line to the WG might be the culprit.
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1986 951, 89k miles, CCW Classics (black) 17" x 10" (275/40) & 17" x 9" (255/40)
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