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1987 944 Power loss at low rpm

Engine

Model: 944, Year:1987, Mileage:135000, Type of use:Street use only
When driving in first gear and into second gear there is definite lack of power and the car struggles to reach speed but once I reach around 3500 to 4000 rpm in second gear the power kicks in rather sudden and back to normal acceleration. Other gears operate at normal acceleration. This sudden drop in power is intermittent. Ive heard the cat can become clogged overtime and create more back pressure. Any other possible causes?

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