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Unless they changed from 1999, the coils are mounted on the plugs. There are no plug wires and you cannot pull back any rubber boot to see if they are seated.
I just worked on a Volvo Urban Assault Vehicle with a misfire on cylinder 6. Changed the plugs and swapped the coils between 5 and 6. The misfire did not move so the problem had to be the injector. Swapped injectors 5 and 6 and the misfire followed. These injectors are stupid expensive considering they are just rebranded FoMoCo parts. I used a battery to open the injector and blew it out with air from the outlet side then filled it with WD-40 and blew that through the nozzle. Misfire went away.
Any water that gets into the fuel system will cause problems as the holes in the injectors are too small to let it pass through.
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