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1987 944 Turbo Hesitation under boost

Engine

Vehicle Information: Model(924/944/968): 951; Year: 1987; Body Type: Coupe; Total Mileage: 103,000;

I have a bad hesitation ONLY during boost. Hesitation disappears at wide-open throttle. No hesitation until boost starts. Replaced: plugs, rotor, ignition wires, fuel filter. Tested ok: air flow meter, throttle position sensor. Checked all vacuum lines. Could this be the flywheel sensor?

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