Its definitely not me putting the wires backwards, I made sure of that. And the car has pretty good power with the old plugs in so I don't think its been running on 2 cylinders. But I'm going to check the gap on the plugs just to make sure. Also put in one plug at a time to try and figure out which one could possibly be faulty. And It was definitely back firing. If its not what I stated then I'm going to check the timing on it. Thanks for the input Empire.....good info.