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Re: 2004 Cavalier P0455 code - engine revving
gas cap would be first suspect for code, but could be other problem. if idle surge is connected to code, could be purge valve, or a vacuum leak around there. just for the sake of ruling it out, if equipped, turn off cruise control.
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Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.
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