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What does it mean when a 1998 mark VIII is idle and the rpm's jump erratically up and down?
Wiki User
∙ 16y ago
It sounds like the IAC valve which is very easy to change on the 97-98 models but first check to see if there is a vacuum leak. Hope this helps. The IAC is the Idle Air Control valve and is on top of the intake manifold driver's side.
Wiki User
∙ 16y ago
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