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I keep getting a P401 code EGR flow insufficent on my 2003 honda civic 1.7 on 2003 Honda Civic

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I have cleaned around the EGR port several times but still getting the code. After cleaning I can run the car for about 30 minutes but will still get the code. I have even bought a new one but still getting the code. What else could be wrong.
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the amount of vacuum to the valve. hondas are common for carbon clogging the vacuum ports to the egr. have a shop verify this.

Roy
What ports are you talking about this only has an electrical connection to the top of the valve..
when you remove the valve, there are 2 ports. one is exhaust and one engine vacuum. the engine side tends to clog badly with carbon.

Roy