Rough idle when cold due to upper intake manifold gasket leak on Mercury Mountaineer
Problem overview
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.
12 people reported this problem
1 commentMercury Mountaineer vehicles with this problem
Average mileage: 182,300 miles
(158,000 - 206,600)
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