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I need help please ! I have a ford f150 4.6 Symptoms are the following ....

No power under load . Won't even spin tires in dirt . Take off from stop very labored . to speed up from rolling , it went get power until it drops down to next gear . plenty of power when in neutral or park. The following have been checked ... New fuel filter installed Fuel pressure test done ...( 5lbs key on not started )(32 when at idle ) 40+ with vacume disconnected ). Cats verified open by removing o2 sensors (no difference ) Throttle plate cleaned( did not remove throttle body though) Air cleaner is clean New coil packs Fuel pressure regulator checked (no gas in line ) Please advise if you have any ideas Thanks

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Really sounds like a transmission issue since the engine runs great in park/neutral and no power in low gear, if reverse is bad too, then one of the solenoids or clutch drum is bad.

Posted on Apr 20, 2017


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