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Q: Transmission "Chuggle" on 1991 Pontiac Grand Prix

My car feels like it's towing a trailer at lower speeds driving around the city. My repair manual calls it "Chuggle" but they don't tell me how to fix it. It's a back and forth type of motion that doesn't seem to depend of outdoor or engine temperature. It doesn't happen on the expressway. I just bought the car about 4 weeks ago, so I'm not familiar with all of its idiosyncrasies. Please help.
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Sometimes a 'chuggle' is caused by a a sticking torque converter clutch. Do you ever get a Service Engine Soon Light coming on? This can help you to determine what the problem is. Try driving in a lower gear like '2' or '3' around town and see if this helps. Do it as soon as you start the car because once the converter locks up, is stays that way for quite awhile.
I have a 1999 Pontiac with similar problem -- you could try having a full transmission fluid-flush replacement -- make sure its the vacuum type removal -- cost you roughly $150 - this may cure the problem or at least reduce the occurrence .. If it doesn't, it's a major tranmission repair but I've avoided this so far by the fluid change.
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