Ok I have read in the past that these trucks have the high idle function built into the computer but it just needs to be activated my owners manual also says it just needs to be activated. Anyways i called the dealer to see if they would turn it on they told me 100 bucks then they told me they cant do it anymore on my 09 and said it had something to with its regen. Do any of you guys have it activated on your 09 or is the dealer just suffering their normal ignorance. ps this is a stock truck with the J35 update