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It is passible that the egr needs cleaning only. TAke it off and clean the carbon from it and where it mounts. Check the wiring and vacuum to it also. If it still doesn't work, replace it. It is the 3 inch round thing at the rear of the engine.

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โˆ™ 2015-07-15 19:28:48
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Q: How hard is it to change the EGR valve on a 97 Tahoe and are there anythings you may need to be concerned about?
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