Nissan Sentra EGR problem

I have a 1990 Nissan Sentra with 300K miles. The check engine light came on and the code was #32 meaning the EGR system is in troble. I found out that the EGR was stuck open. I replace it and reset computer. However, the light came back on. What else do I need to check or do? When the light was on and the EGR valve was open, the car ran good without any problem.