Car is running rough. Only getting spark from the P/S. Replaced rotor and cap, tried new blaster, still nothing. Any ideas?

 

a bit skinny on info but you have a sc400 I take it and its only getting spark from the passenger side? are you sure about that?
If you check the middle 2 plugs on the drivers side you will find they have spark also like the front and back plug on the passenger side.
When you loose the drivers coil you loose the front and rear plug on the drivers side, and the middle 2 plugs on the passenger side.

So if you checked the front plug on the passenger side and it was working, I am pretty sure you have a bad drivers side coil.

the sc400 has 2 distributors, 2 caps, and 2 rotors. change them on both sides.
each distributor feeds 2 cylinders on both sides of the motor, so chances are if you check some of the other ones on the drivers side you will find 2 that are working on each side.

My guess is that one of your coils went bad. this happens all the time on sc400's. disconnect 1 at a time whichever has no change when disconnecting is the bad one.

For reference. if you were checking the front plugs for spark only then its the drivers side coil that is bad if the passenger side in the front is working.