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Worn coils will have a constant misfire. If they're worn (the insulation cracks and spark jumps to head instead of being routed through the plug) it'll be noticeable immediately upon startup; especially on rainy/humid days.
Any heat soak engine performance issues are usually caused by failing, heat sensitive electronics. Camshaft and crankshaft position sensors are the primary suspect.
My go-to trick is to run the engine till it heat soaks and begins running poorly, shut it off, remove the suspect component (the CAS, in this case) and pop it in the freezer for a few minutes to cool it off. Reinstall the component onto the still heat soaked engine and fire it up. If it now runs correctly for a few minutes; you've found the problem.
I'm assuming you've monitored the battery voltage and air/fuel ratio to eliminate any concerns in those specific areas.
I keep telling people: these engines are now twenty years old. If it's still on the original coils and CAS and they haven't failed yet, they are guaranteed to fail in the near future.
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