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2009 Chevy Traverse. Rpms jump [way over] when accelerating then catch up.
What is causing this event.? This would be at start up. [ waiting for a light etc]
 

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2009 Chevy Traverse. Rpms jump [way over] when accelerating then catch up.
What is causing this event.? This would be at start up. [ waiting for a light etc]
Most like it is the crank position sensor is failing. Dealer can verify this in minutes and replace it if it is bad. Do this before it fails completely and leaves you stuck alongside the road or worse.
 
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