ANSWERS: 2
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I'm not a mechanic by any means but i can think of a few reasons/problems. 1. It may have bad fuel. 2. It may have bad spark plugs. 3. Could have a filthy air filter. 4. Could be a safety device that keeps you from over revving in neutral or park to keep you from blowing the motor. Thats all i can think of.
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Ford puts rev limiters on the trucks to prevent it from "blowing up" it's for your safety and the engines safety it can be taken off with a tuner or at the dealership. There is no reason for you to rev it that high anyways
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