ok my car i acting funny im sitting at a light and when i go to take off it like breaking up and jerking sounds like a wrx but it only does it from like 1000 to 3000 some time but when i give a full gas i starts to break up anyone know what the problem could be i think it could be a bent valve but looking for help also could a use gsr valve train in my b18b head know i can not use cams but everything else