My 92 F150 4x4 5.0 V8 will have a high idle until i shift it into gear, then at the top end of each gear it will just roar and sputter slowing down the vehicle before shifting and accelerate again. When i floor it it just roars and sputters, replaced the fuel filter, the relays for the fuel pump, replaced the distributor, and replaced the spark plugs. Tranny fluid is full and clean, oil is full and clean. Check engine light is not on.
My car has 170000 miles.
My car has an automatic transmission.
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