1998 Honda Civic

My 1998 Honda Civic began making a clicking/putting noise which increases in frequency as I accelerate and decreases and eventually extinguishes when I deccelerate. It is loudest with the windows closed so it doesn't sound like it's coming from the outside. I did recently hit a large, wide pothole at a decent speed. Any ideas about what this might be? I'm supposed to drive about 300 miles this weekend and don't want to drive if it will hurt something.
January 24, 2006.

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