what are the symptoms of a bad knock sensor on a lt1 and if i unplug it what should happen? my car is running bad and i unplugged it and nothing happend, it stayed running bad.

 

You'd get an SES light.

 

If it was running bad because of a knock sensor issue, unplugging it would probably make no difference. It is a poor way to test, though. An unplugged knock sensor would cause an immediate retardation of timing to protect the engine (meaning, it is not going to run very strong).

http://shbox.com/1/4th_gen_tech2.html#knock_sensor