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revving problems

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spiff:
For some reason my 93 5.0 will not rev past 3000 rpm. If I feather the throttle in neutral in will but it is rough. Will not do it at all in gear. Does anyone know where to start looking for the problem?

BlackShadow:
Have you changed your fuel filter, sound almost like it starving for fuel, maybe weak fuel pump, but this is kind of a wild guess with out know much more.

Arthurtoth:
It might have vac leaks. Is its VSS sensor working properly? Check it once.

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