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1992 964 C2 Engine "chirp"

Engine

Vehicle Information: Model: C2 - 964; Year: 1992; Body Type: Targa; Total Mileage: 71,000;

Under heavy acceleration, the engine emits a noise that I can best describe as a chirp, like a bird.Under average acceleration - through 5K RPM - no chirp at all.I'm baffled!Thanks, Doug

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