Ford expedition misfiring?

I have a 2001 Ford expedition 5.4l. I recently got caught in a bad storm and drove my truck through a few inches of water. During my drive my truck started to run rough and the "service engine soon" light started to blink. Now my truck runs rough and when I'm at a stop the engine would give a pulse. Took it to orielys and autozone to check for codes and found no codes. After leaving, a few miles later the light came back but stayed solid. What could it be?

Remove all the coils and check the coil wells for moisture.

Do not try and remove plugs without an experienced technician at hand. The Triton Spark Plug is of a very odd design and is prone to fracturing in the cylinder head. Tools are available to remove the insulators that are left behind but you don't want to get into that. My guess is cylinder 4 coil tunnel has water. Seems to be that one all the time. Do not drive too far with a misfire as it will damage the catalytic converter…

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