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2007 f350 6.0
engine light came on when pulling an empty trailer up a hill the other day and I just reset it and went on. last night i was pulling a load of calves i started out up a steep grade and it had plenty of power and when I got out on the highway I noticed the speedometer wasn't working after a few miles it kicked in and probably 7 miles later the engine light came on again and this time i seemed to be down a little bit on power but not a bunch everything else seemed to function fine anyone have any ideas ??