2000 Jaguar S-Type 3.0L will not start after spark plug coils failure. It all started with several misfires on more than one bank. I had to drive the car back home, it turned off on the way back when I stopped for a red light., had to wait a while for it to turn back on. It turned off several times until eventually it stopped turning back on. First thing I did is replaced the bad coils, didn't work. So I went ahead and replaced the starter, same thing, didn't work. Then decided to replace the alternator and battery, but it still doesn't start. Electrical systems seem to work, constant click is present when I try to crank.