I am having a bit of trouble with my 83, it seems to be missing through all the rpms. It seems to be an irregular miss, too. I can tell it is way down on power . Here is what I have done to try and correct it: new fuel filter, checked injectors, distributer rotor, checked cam position and timing, new plugs and wires. I really don't know what it could be that is causing this, if anyone could help I would really appreciate your thoughts and imput!