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Get somebody to read the codes. there is a speed sensor that has to be replace in your vehicle and that is why the servie engine soon light come on because it is aware of the problem when the speed is jumping around.

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โˆ™ 2004-12-04 16:34:13
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Q: What is wrong with a 1999 ZR2 Blazer when the speedometer skips and the service engine light comes on and off on long trips?
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