I have a VW Jetta 1993 when I press the accelerator hard it starts jerking as if it is out of fuel?

It runs fine as such but except for what I mentioned. The problem is most prominent when I change gears and try to accelerate fast, but if I take it easy it runs fine. I am thinking that it might be the spark plugs or the fuel filter as they were changed at 75000 and now it's 125000 miles. Please help me out.
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