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1987 944 Engine 'pulses'

Engine

Vehicle Information: Model(924/944/968): 944; Year: 1987; Body Type: Coupe; Total Mileage: 160k;

During acceleration, the car hesitates, goes some, hesitates again and so on. Although most noticeable during acceleration, I can also feel this 'pulsing' when cruising. I've checked the plugs, distributor, rotor arm and they all look good, and I've also cleaned the K&N and changed the fuel filter. Your past answers suggest it is probably the Airflow Meter, but a work colleague suggested the Throttle Position Sensor could be the culprit?

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