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its a V6 engine. I agree if it was the CAT I would think I would get a service engine light or something for emissions failing, or running rough because of a misfire if the computer was sending the wrong signals to compromise. The rattle has been an on going noise, but the truck has always ran...

Here goes, hope someone can help I'm in a bad situation my mechanic is telling me one thing, and my mechanic cousin is telling me another. We can't seem to diagnose the problem. 2004 Ford Explorer, 137k highway miles kept in great shape regular maintenance. For the past year it has been making...