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Mine has high idle for cold starts, too, if I understand what you're saying.
Dave, you said you shut down at 300. Mine doesn't often get that low even idling. The probe for my EGT gauge is in the exhaust manifold, pre-turbo. By chance is yours post-turbo? That would result in the lower readings if you do. Just trying to make sure both are apples.
Bob, I've let mine run after a hard run while we trek into a rest area restroom. I lock the foor but if I lock the door with the electric lock button with the key in the ignition the driver door will auto unlock right away. I have to lock it by pressing down the button on the door sill. This truck came with the combination lock on the outside of the door. I thought I'd never use that but this is one situation where it is handy to unlock the door when we return and the engine is running.
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