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There is no way of knowing with just a brief description like that. Use a code scanner to figure out what's wrong. The computer has stored a fault code if the light is on, so why not see what it says?

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โˆ™ 2006-03-28 16:37:55
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Q: When your 98 Chevy cavalier 2.2 liter is idoling the rpms start to drop down and shoot back up and the engine light just came on does anyone know why?
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