My son has a 95 toyota 4runner that died while he was driving it , it has always had a slight miss at idle and lower rpms , the previous owner had the motor replaced with a remaned about 4k miles ago , so anyway we had replaced plugs, wires, cap trying to get rid of the miss before it died, now we have replaced the the coil, ignitor and distributor and still no spark and I cant get a pulse signal to the ignitor. What else can I can check ? I'm loosing my patience with this thing