code 32 SES

Getting a code 32 from SES. What code is this for a 93 chevy suburban. Please help

32, EGR open command did not change the fuel mixture when the command was given during off idle operation. EGR opening should cause the mixture to be slightly richer because of the low oxygen content of the exhaust gas. EGR position signal is also monitored to verify EGR movement.

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What can I do to correct the problem?