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Our GMC Acadia has an issue similar to yours, but it occurs much sooner than 3 minutes and 45 seconds after startup. I would say it occurs 15 seconds after startup. It happens, as you said, "like clockwork" if the Acadia has been allowed to sit overnight and is cold.

I hate that sound. For about a second, the RPMs drop, and it sounds like the engine is going to die.
 
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