Rough idle,stall at 30mph at let off, stall at idle ,excessive gas use,exhaust smell

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The auto starts ok but has a rough idle, stalls after warm up on let off at 30mph. Has strong gas smell. Stalls at idle post warm up. Codes 33 EGR not closing, 42 rich fuel,41 oxygen sensor.--Changed sensor, cked EGR-- clean,closed & no vac. applied