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The truck starts quickly warm or cold but recently when cold at high altitude it ran fine for the first 15 seconds or so then started idling rough and blowing a ton of white smoke. Thats when i replaced the fuel filter. The old filter did have alot of redish little dots in it. Now it hasnt done the rough Idle and didnt start blowing white smoke until I decelerated or gave the gas after coasting for a while. Dont know if this is related but it doesnt seem to slow down much when I downshift.
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