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Just a small line with the valve/filter thingy on it, doesn't connect anywhere else.

Excess flow is either bad a gasket, or an EGR sticking open. If it's new, it shouldn't be carbon making it stick, so it's either faulty internally or needs a new gasket.

Has the EGR been adapted?

Is the EGR aftermarket? They don't seem to work too well. Genuine used can be had for cheap.
 
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