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I have a 96 Camaro Z28 and the Service Engine Soon light came on,
I work at a import car dealer and one of the mechanic used a scan tool and pulled the code P0400 EGR System Malfunctionm, not being a import they are unsure what this could be ( is too rich, too lean etc.)
The forum has always been very helpful when I owned my Corvette so I figured maybe some one might have some helpful information.