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'07 Silverado


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It's starting to get pretty cold now, and when my truck sets out with temps in low 20s it does not want to idle down when it reaches operating temp. I drive about 10 miles home and when I back in garage it's still running between 700-800 RPM. I can shut the truck off, start it back up and put it in drive and it will idle at 600 RPM. I have had it at the dealers and they downloaded some new software but it did not help. Any ideas would be appreciated.

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