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 Probably going to need more info on this. What have you tested so far? 

 Truck is a '99, so far that's all we know. Auto, manual, milage, mods or all stock and so on. There are so many different combos both stock and aftermarket. The guys here will help you though the best they can but they also need all the information you can give them to help make an online diagnosis. 

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Also check for trouble codes. They are helpful even if they dont point to something specific. Not all codes set the CEL either. Then again not all problems set a trouble code.

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