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Why does your gmc sierra idle 1500 rpm yet when you shut it off and restart it will go to normal rpm?
Gmcdaddy
It is normal for a GMC Sierra to idle fast when it is first started. It will idle at around 1500 rpm until the engine warms up. To get it to slow the rpm's sooner, a person can tap the throttle once and it should slow down.
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∙ 9y ago
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