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Where is this water coming from?

I have a 1999 quest with a 3.5 engine. The car has been great until now.

Water is getting into the #3 and #5 spark pulg wells and causing severe mis fires and knocks.

The water does not have any color to it so its not anti freeze. There is no sign of water on top of the intake manifold.

But I can see a rust trail running down the side of the spark plug wells from under the intake manifold.

My question.

Is there anything under the intake manifold where water can accumulate?