Rough Idle When Cold Due to Upper Intake Manifold Gasket Leak on Ford Explorer

The Check Engine Light will illuminate and the engine will idle roughly when cold. There are updated upper intake manifold gaskets to resolve the problem.

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Average mileage: 129,662 (51,000–205,631)
Engines affected: 4.0L V6, 4.0L V6 SOHC
5 model years affected: 1997, 1998, 1999, 2000, more2001
18 people reported this problem
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problem details
1998 Ford Explorer - 4.0L V6 SOHC 70,000 mi,
Replaced intake manifold. Cost about $500. They tried other things first (that didn't work) for another $400.
1999 Ford Explorer - 4.0L V6 SOHC 68,000 mi,
engine light on and truck dies or idles rough till warm.
1999 Ford Explorer - 4.0L V6 SOHC 124,000 mi,
intake manifold gaskets replaced
I could not solve it
1998 Ford Explorer 180,000 mi,
new intake manifold gaskets