Sc400 Missing At Idle And Cruising Speeds

[John Gardynecki]

1992 sc400

Out of nowhere this missing and chugging while at crusing speed thing started... also after turning the car off I could smell rotten eggs ( cats working OT). Is there a common part that goes? I've searched and noticed alot of people reporting that this could be a ignition coil. but which one, how can one tell?

I can't believe that wires or a cap/rotor would just go instantly... must be electrical??? Any idea's would be great!!!