This 2004 Nissan XTerra 4x4 V6 can't pass the NYS Emissions test because of a persistent
P0172 Fuel System Too RICH code.
On a cold start it coughs and stumbles; runs OK when it warms up, but the fuel economy is in the gutter.

Let's look at the FUEL TRIMS of the entire engine, and determine what exactly is causing the extremely rich condition.
What seems to be a simple diagnosis turns into a weird case study...

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Enjoy!
Ivan