Something doesn't sound good here. Unless you were going straight up the mountain, you should not have had an issue with breaking 80 mph. In CO i get up to the mountains and have no problem breaking 100 with a full bus and gear. The only mod I have done is a hypertech programmer.
Bad gas?
Bad fuel filter?
How's your air filter?
I'm reaching here. I guess it's back to the dealer. good luck.
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TAIL RATED!
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