my car is missing really bad....
what could be the problems?

 

You really should explain a little more in detail.....

As I see you have mods, was it tuned?? Who tuned it? When was the last time plugs and wires done, milage?, any DTC error codes?, Was the fuel pump replaced?, When did this happen?

 

well its not missing that much anymore
now its knockin a little bit

 

What plugs are you running?:

 

Bad o2's?

 

Ok, this is the part where you give use some background. Conditions etc etc.

 

blown motor buy a new one

 

I have a motor for sale. $1,800.00 LS1 MS4 cam etc etc aroun d 480hp at the crank