Just throwing out ideas
The best way to find this headache of intermittent no start and stall is to wait for it to totally die. But as a knee jerk thought I would say it dies when hitting bumps. so a loose or bad electrical connection comes to mind.
The two things that may cause such a quick shut down and is an issue on the 200's might be a bad CPS ( but you said you replaced it. Have you looked at the 25 amp fuse on the Drivers Fender? I believe 1990 still had that fuse mounted there. The Fuse Holder gets too hot over the years and it makes for a bad connection.
Did you check the connections at the Main Fuel pump. you say it ran when you jumped it but if it's a bad connection at the pump it may have worked at Test but disconnects when hitting a bump.

Oh, another thought... are all the ignition wires pushed down fully in the Cap and Coil? Sometimes the Rubber hat will ride up the Cap and unplug. In fact as kids we used to mess with friends by lifting a wire off the Cap slighty Can't tell it's off but it would cause the car to run intermittently. Back in the day when you opened the hood from the outside of the car.
Check the Connector on the coil. See if the spade lugs are tight on the + and - of the coil


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