Joined
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878 Posts
I have no experience with these trucks but it sounds like an ignition problem to me. Water on broken insulation could be shorting your ignition system out, which will cause a misfire (chugging as the engine misses on one cylinder) and a temporary check engine as the computer picks up the misfire. Where the water is coming from and which component is shorting, I have no idea, quite possibly ImperialCrown's suggestion.