Very Sluggish
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Joined: Aug 2006
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Very Sluggish
I have a 2003 F250 SD 5.4L Automatic that when I really get on it to try to pass or going up a steep grade the engine revs up to 4200 RPM's max and then the speed starts to fall off. Have changed fuel filters, taken to Ford dealer they do not have any idea what is causing this on their diagnostics, but do suspect possible fuel pump starting to fail although it does test oK. Truck has 47k miles. Any suggestions would be greatly appreciated.
