Digital E.G.R. valve 94 Camaro V6 problem

94 Camaro V6 auto Digital three vale E.G.R. valve Diagnosis shows all three solenoids failed. Removed and cleaned out all three valves and contacts. Replaced with new gadket. Still have
same codes. Service tech said that was unusual all three failed.
Is this unusual? Any else to check? Thanks
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follow flow of diagnostics... make sure voltage is to spec from the computer to the egr. check resistance on the egr itself. I would replace the egr...clear codes....and ride.
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