bad torque converter .
No, it will not cause the engine to knock.
A bad torque converter can cause slipping gears. The fuel mileage will suffer as well, and the engine will rev higher.
I'd say "not likely". While it's possible that a torque converter is out of balance enough to cause a vibration, in general that's not the case unless it has been hit or damaged in some other way. It might be better to talk to someone who knows what he is talking about.
Torque converter lock-up solenoid is bad. Common problem with 1988 Beretta.
torque converter can cause this. you will have bucking and stalling. another thing it can be ( I know this to be true as it happened to me) is the cat converter.
Loose converter bolts or a cracked pressure plate.
loose or missing torque converter bolt to the flywheel
Yes there are.
Either the solenoid pack or most likely the torque converter itself.
It could, yes.