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Q: would a defective egr valve cause your engine to quit at highway speeds? on 1991 Pontiac Grand Am

i was driving home from work on the parkway going 65mph when the engine lost power and quit.when i tried restarting it would just crank and sometimes backfire thru the carburetor.i got the car home did some checking,the engine will start without the egr but the rpms soar.
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