What else could be causing the service light to stay on and my car to still idle rough?

1998 BUICK CENTURY
186,000 MILES
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BAILEY#1
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My service light came on I had it scanned it said the Egr wasnt circulating right, It started cutting out really bad, changed the plugs and wires first, then changed the egr valve a week later it is still idling rough and the light came back on, and says the same thing
Sep 22, 2011 at 3:13 PM
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KHLOW2008
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What is the EXACT trouble code you are getting?

Rough idling can be due to a few causes. If the idling speed is too low, it is usually due to a dirty thriottle body and IAC valve, retericting air flow.
Sep 22, 2011 at 3:34 PM
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BAILEY#1
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P0401 is the code it gives

Sep 22, 2011 at 5:14 PM
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KHLOW2008
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Changing the EGR valve along usually don't work. You need to clean the EGR exhaust gas passages to rectify the problem.
Sep 22, 2011 at 10:27 PM