1998 Chevy Lumina egr valve

1998 CHEVROLET LUMINA
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DDEHART
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1998 Chevy Lumina 6 cyl Front Wheel Drive 230000 miles
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Egr valve has been replacedtwice within 6 months, the service engine light continues to come on with egr flow issue and code PO401 the egr was replaced and codes cleared. Where do I go from here???

Respectfully
Michael DeHart
May 21, 2008 at 9:44 PM
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LEGITIMATE007
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the egr tube could be clogged, also change pcv valve
May 21, 2008 at 9:55 PM