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Do you completely empty the fuel filter housing?
When you open the drain valve the fuel drains on the floor. The first thing I would do is replace the fuel filter first. When you open the drain valve does it act like there is air in the system?
If it's idling rough when the valve is closed its likely bad injector O rings. I would test fuel pump pressure to make sure. Usually if the injector I rings go out opening the drain valve will make the vehicle run smooth for a short amount of time. This is a time consuming job so I recommend replacing all 8 o ring sets. Once you do this the vehicle will drive like its brand new.
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Is there fuel in the antifreeze?
The fluid can transfer when an injector is removed though the cylinder head. It usually leaks into the cylinder.