Crank no start "sounds dry"

Won't start changed cap, rotor, cam, and crank, sensors. It has orange spark when it first shut off a month ago. It smelled like old gas when I would try to start it. Also a little rotten egg smell. Like a month before it shut off the fuel gauge stopped working and my husband tried to change heater core. When he put a little gas into the throttle body there is no difference in how it sounds.