1998 Saab 900 Engine Acceleration Problem

At approximately 2000 RPM, upon acceleration (pressing accelerator) the engine hesitate and loses power. After short-duration of hesitation and lose of power, car then accelerates. It seems that I can also override hesitation and lose of power by pressing accelerator further. I have already checked the spark plugs, changed the fuel filter and adjusted accelerator cable. Can you provide any insight on how to correct this problem?

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