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    SOLVED Please help, engine runs very poorly!

    Hello, I have a recently acquired 2005 GMC Yukon XL 1500 SLE with a 5.3L flex engine. It's been running poorly ever since I got it. I've been trying (diligently) to figure it out to no avail. I've done so many things to it and nothing has helped. I'm running out of ideas. Symptoms include...

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