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Q: I hear a rattling/knocking noise coming from underneath when I press gas pedal on 2004 Ford Expedition

Everything was checked to be ok, I have oil and transmission fluid was ok. Theres no noise when truck is on idle.
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It would be easier if we could hear the noise. Do you have someone you trust to help identify the sound.
I am having someone look at it today, but over the weekend one person said it could be the flywheel and another said the catalyst converter. I wont know until later on today. But like I said it only does this when I press on the gas pedal like something is rattling underneath.
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