Question about 2005 Buick Rendezvous

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2005 Buick Rendevous Idles / Runs at 2000 - 3500 RPM

I am the original owner of a 2005 Buick Rendezvous that will intermittently idle / run at 2000 - 3500 without pressing the accelerator pedal. There does not seem to be any common attribute (Time / Temperature / Road Condition etc) to tie to a cause. This will happen in park or while driving, again with no apparent pattern.

The primary system control module was replaced under warranty three years ago.

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have you replaced your ignition module?

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Stuck IAC idler air control valve OR vacume leak.

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