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01 Silverado high idle..... Very high idle

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Hello everyone, new to the forum. I've searched and looked thru any related issue post and none are quite like mine. This will be long, so bare with me.

I'm not exactly sure when this started, but when I bought the truck 2 years ago, it didn't have this problem.

Present issue I have.... Up till about a month ago, when I started the truck in the morning, it started with a high idle, when I say high idle I'm talking 3000-3300 rpm. I have let it run like that for maybe 5 seconds, but I'm...

01 Silverado high idle..... Very high idle

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