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Assuming it is a 302 or 351W with EFI,

it could be,a restricted/damaged catalytic converter,

a restriction in the exhaust system,

a restricted/dirty fuel filter,

a faulty fuel pump,

a faulty fuel pressure regulator,

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Q: My 1986 F150 4x4 8 cyl. two gas tank pick up truck will not run over 35 mph why?
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