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Q: IDLE STAYS AT2500 AND WONT COME DOWN on 2009 GMC Savana 3500

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IDLE STAYS AT 2500 WONT COME DOWN
(1) Answer
there is a problem with the engine control system or a big air leak into the intake system. I'd guess that the check engine light is on.
The check engine light indicates that the computer has detected a malfunction in the engine/emission control system and has diagnostic codes and data stored which would be essential in diagnosing the problem.
A technician with a scanner could access the diagnostic codes and data and then be able to give you a diagnosis.
If you want to find a GM specialist, here's our directory link for you:
https://repairpal.com/directory?address=16105&car_brand_names=GMC