Q: Engine stutters under load in high gear.

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My 1997 F250 7.5L (460) gasoline engine stutters when pulling hills (or under load) in high gear. This is the 5-speed manual transmission 4x4 HD model. There is no change in engine sound, just a hitch that can be felt. I have replaced the distributor cap, rotor, wires, and plugs as well as the fuel filter. Any suggestions?

My car has 102000 miles.
My car has a manual transmission.

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