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Originally Posted by ScubaLatt
sounds like underneath the truck but not totally under the engine.
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sounds like an exhaust problem... maybe catalytic convertor going out or an exhaust leak. That kind of stuff will make your check engine light come on for sure. I would follow the suggestions and get a free diagnostic run but you might also bring it by a muffler shop and get them to look at it. Any reputable muffler place wont charge you to take a look at it.