Weird idle

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BrettsdirtyHOE

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Hi guys I'm trying to figure out my weird idle issue on my Tahoe and I'm hoping someone can point me in the right direction. My Tahoe has been idling funny this past month. It idles perfect at start up and stays at 500 like its supposed to. Then once it warms up it then starts to idle higher around 800 rpm when in drive or around 1000 rpm when in neutral. When it does this it also holds out 1st and 2nd gear a tad longer and lurches forward when it shifts on light steady throttle. Tow/haul is off. I have tried checking for vacuum leaks by spraying seafoam / Carb cleaner around the intake manifold and vacuum lines and nothing. Also checked the IAC valve and it appears to be functioning like its supposed to. I'm about to give up and take it to a shop. Any ideas or suggestions before I say ferk it.

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