Talon62

So i finally changes my lower manifold gaskets as well as my plenum gasket. Finally my overheating days are of but i have ran into another problem. After I changed all this and the next day a loud knocking started and would get worse at 3000rpm but the stop at anything over 5000rpm. I changed the oil the next day and turned the car on to get it to start running through hoping the knock would stop. After about 5 minutes i hoped out the car to shut the garage and take my car for a spin since the knocking stopped. Then I heard a loud screech and the engine cut off. Now when I try to start it up it will turn over twice but will not start. Also when i looked for the source of the knock i could not fine it. Either side I looked on, the knock sounded to come from the other side. I also changed the o rings on the fuel rail and i believe that the injectors are running the best they have since we bought the car 8 years ago. Someone please tell me they know what is wrong.