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1987 944Turbo Engine cuts out on full turbo boost

Engine

Vehicle Information: Model(924/944/968): 944 Turbo; Year: 1987; Body Type: Coupe; Total Mileage: 120000;

Whenever I floor the accelerator (full boost), after 2-3 seconds, engine dies/fires intermittently until I back off on the gas when it recovers and will run to 120mph easily on very light to no turbo boost. Have changed fuel filter, pump and pump relay - no improvement.What should I try next?

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