If you fill the sink (?), does it drain quickly, or slowly? If slowly, you may have a partial blockage. I saw one of these do it yourself plastic drain cleaners (ACE hardware I think). These are inserted, and pulled back out and the hooks grab the clog and pull it out. You could also try one of the chemical drain cleaners. The other possibility might be a clogged vent pipe. This will probably need a plumber to verify.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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