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  1. Chevy Silverado Forum (GMC Sierra)
    Hello I'm new on here, I hope yall can help me out. I have a 2015 GMC 3500HD 6.0l gas. I recently bought it and then noticed that when in idle it began to run rough and I can give it some gas and at times it will go but very slowly and sluggish then it will pop and start running better or it...
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