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Sorry don't know if this is a good section, as there is no section for this engine. My buddy's mountaineer has a problem when he starts it. The idle goes up and down randomly. If it revs down too far the car dies. It continues this activity until the engine warms up. Does anybody know what could be causing this?
 

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Sorry don't know if this is a good section, as there is no section for this engine. My buddy's mountaineer has a problem when he starts it. The idle goes up and down randomly. If it revs down too far the car dies. It continues this activity until the engine warms up. Does anybody know what could be causing this?
If not the IAC it is the infamous 4.0 SOHC intake manifold gasket problem. Search explorerforum for lots of info. They usually cause fast idle, but go away as the car warms up.
 
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