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Why does the engine lose power?

(1999 Ford F-250 Super Duty)
in Santaquin, UT on January 15, 2016
Displaying 1 answer & 1 comment
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on January 15, 2016
At what stage? Highway speed? Idle? Pulling?
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on January 19, 2016
just going up any kind of hill it will die like it will be at 45 mph and drop to 25 mph going down.
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