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when I put the car in neutral, and press the gas,at around 4000 rmp, my engine starts to make a weird noise
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Thats the Rev Limiter that's set-up in the PCM for when the car is either in park or neutral.
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I am getting a weird banging noise coming from the exhaust sometimes when this happens.
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Sounds like you should take the car to an exhaust shop or get it on a hoist and see if anything is lose.
~Larry~