Loss of power at high speed?

High, I have a 94 ford bronco 351w (5.8) and I lose power at high speeds! 3rd and overdrive is when it happens. My rpms drop to about 1000 and I can't speed up as fast as I used to!

Do a tune up, spark plugs, wires, add a bottle of seafoam or lucas injector cleaner in there and replace your fuel filter (sounds like its clogged) while youre at it. Total cost should be around $50.

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