Sure, sounds like it could be the coilpack.
Does it ever misfire under acceleration or stall? Occasionally these symptoms will accompany.
If the coilpack has hairline cracks in it (which allow moisture in), you should be able to see them.
A lot of people take the coilpack off, dry it out in direct sunlight or in a low temperature oven, and then epoxy the outside of the unit to re-seal the cracks. This can be helpful if the coils are not too far gone.
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