Q: Truck running rough over 55 MPH.
I have over 140,000 miles on my truck. The Engine light is on and it starts running rough when driving over 55 MPH. I have never had a tune-up performed on it.
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I would have a technician come scan the codes on the computer and perform a tune up as well. Your spark plugs are recommended to be replaced at 30,000 miles. I would also replace your fuel filter as well. They have been known to clog up damaging the fuel pump and restricting flow to the injectors.
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