30 lbs OF FUEL PRESURE??? YES NO ???
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sounds like it could be a mis-fire, or a number of things. have you checked your spark plugs lately? very bad spark plugs will do what you're describing, or could be a bad ignition coil. im not good at diagnosing over the internet. a bad fuel pump wont really shake, it just feels like the truck is running out of gas, and normally wont go over 20-30 mpg no matter how much you press the throttle
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but damn 251k miles, do you have any leaks or cel lights coming on.
just goes to show you how built those old ford engines are
thats one way to do it
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