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That sounds like the torque converter is dying. If you punch the gas at low rpm's, its supposed to slip to allow the engine to rev high enough so that it won't bog down. If that function isn't working right, you'll get the problem you describe. Most torque converters also have a (usually computer controlled) lock, that makes them exactly like a clutch in a manual car when you're cruising. I think that's what's not working right. If the lock does not disengage at low rpm, the car will buck like a manual in gear too long. The lock also has to disengage when shifting gears. Maybe the transmission is trying to downshift when you gas it, and the lock is still engaged. That's kind of like downshifting a manual really really fast and hard, which can sometimes also make the car buck, depending on how everything is set up. Or the lock could be disengaging just after the shift.
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