start by giving us more to go on.
like engine code
year
etc.

if your car is knocking, the motor will not last much longer if you allow it to continue.

you should check your ignition timing with a timing light, and make sure you dont have contaminated fuel or water in your fuel system. also make sure your running 93 octane.

pre-detonation (knocking) is caused by a number of things:
insufficient fuel octane
advanced/improper ignition timing
faulty knock sensor

~kris