Rollin Discussion starter. 2771 posts · Joined 2007. #1 · Aug 31, 2014. My Jeep has the 5.7 Hemi. When I start the vehicle after cold soak, it revs up and then comes immediately down to normal idle. All other vehicles that I have owned idle high and then gradually reduce idle (including a 2011 wk2 with the hemi).
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jeep grand cherokee 5.7 hemi 2008