kylesd22

Ok, so a little bit ago i got into a little wreck with a curb and destroyed my intercooler i tried starting it when it happened but i got a new one and everything was running fine but a little bit after when i started boosting one time it stayed running like crap i drive it home checked then spark plugs and the #4 plug was shut closed i put a new one in and it ran perfect then some srt tried to race me at a red light so i felt the need to smoke him well now its running like crap again, barely holds an idle just keeps wanting to die and has a slight knocking noise i can hear in cylinder 4 another thing is when i was driving it home and id go to brake and the RPMs would go down to like 500 to 600 the brakes would be stiff like it was off and in parked and my battery just died so i'm not sure if that has anything to do with it, don't think so though. Thanks in advance
PLEASE HELP!!!