It sounds like im having the same problem with my 84 300zxT. My car has run fine until recently. I would start it cold and it would idle fine, but when I drive it would lag and bog down if I accelerated too fast until it was warm. Then I would start it hot and I would have to keep it revved above 2K so it didnt die. Now it will not start at all but it turns over. I am getting fuel but no spark. any suggestions?