Yes it is. It can damage the engine.
No, have the converter replaced.
No a bad muffler shouldn't, but a clogged catalytic converter will.
Yes, you can do serious damage to the engine if the converter is clogged.
Yes it does.
Yes.
Yes
no it will run rough and stall out
If fuel injected, yes. Plus it is illegal.
it could be a bad tork converter
You bet it will. It will also used lots of fuel and have no power.
You need to replace the trans or rebuilted it if it's a stick shift the u have a bad gear if it a automatic then check the fluids in the trans if it good on fluid the it a bad trans or torque converter
yes