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Q: I drive a 1999 Yukon denali and in the summer time only it shuts off going down on 2013 GMC Yukon Denali

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The road while driving and will not start up for about an hour its getting worst because it would start up after 10 mins
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Take it your mechanic, he can let it run until it stalls then find the problem while it wont start! Light on? If so may have code(s) with a clue!
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