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I need help I bought a used 2011 5.0 from auction and if you rev it in park it wont protect itself and will rev all the way into redline anyone might know why
 

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The limiter may have been disabled in an unknown tune.

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Look over everything and make sure the car is stock. I would hate for you to find out that the tune is necessary for something.

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Yea don't return the car to stock until you get more information.
 

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Try it and see what happens. Just remember that once it is flashed, you may need a tuner.

Is the exhaust stock?
Is the rear gear ratio stock?

There is the possibility that a previous owner tuned the car for mods that were removed. You may never know that answer.

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