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

Time to unhook the Edge module and see if it occurs again. Even though the module might not of shown it was active it could be something internally damaged.