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Hmm, something odd is going on - on your initial question, no, there's no altitude sensor on your truck, so you can rule that out as a potential culprit. I've had my truck blow tons of white smoke and run rough, but that's cause for a few moments she was running on antifreeze and WMO (which is why one should always check their WMO batches). When these trucks are starving for air they usually smoke black as a result of the overfueling, a white smoke is often an indicator of either coolant being burned off, or timing that is way off.
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