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Discussion Starter #1
I'm really confused. If I spike the pedal down at 30 mph my truck dumps black smoke. If I spike the pedal down at 70 my truck dumps black smoke. For some reason if I spend some time driving between 55 and 50 then hit the pedal for a second and let off it dumps out a white cloud. On of my friends think it has a crappy tune on it? Could this be the cause? Any help would be greatly appreciated.

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Do you have a tune on it or is it still just the oem tune? How many miles?
 

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Discussion Starter #3
I just bought the truck and it has 67000 miles. My buddy thinks it has a tune but I have no idea.


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