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abynormal hi idle

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hello again, I noticed something funny tonight when I pulled in the driveway. after turning stereo down, I went to turn truck off, turned key backwards and pulled key out but truck stayed running then I looked over at the tach and truck was idling at 1200 for no apparent reason. much higher than usual. while it was still running I check the juice module to see if the turbo cool down was on. but it wasn't. at the time it made sense because I had just driven 13hrs. Any thoughts?   thnx in advance,  Bill

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