I recently purchased a 1979 ford f250 ranger xlt with a 460 in it, i've replaced the timing chain, starter, and now the electronic ignition module (mounts to inner fender well) if i crank her over, with my pedal to the floor she sounds like shes runnin but as soon as i let go of the key she stops, and i can't figure out whats wrong. could somebody please tell me what i need to fix/replace now??