gunk under intake manifold

wow, u would think any one designing an engine would know , do, or catch that !
You'd think they would, wouldn't you? They made millions of those engines, and a large number failed. There are a huge number of stories of failure of that engine all over the Internet. Frankly, I'm surprised there wasn't an organized public outcry, demands for a recall, or at least a class action lawsuit.
The saddest part, for me, was that that engine, when running, was amazing. It was incredibly quiet. You could not hear it running. You'd have to pop the hood, and look at the engine to know it was running. It was very powerful, and got near 30mpg in an Intrepid . I'm kinda surprised someone didn't come up with an external water pump conversion for it.