1996 Honda Accord How To Replace EGR Chamber Gasket

My car was running fine except check eng. Code 401 insufficient egr flow. I removed egr chamber and found 3 small ports completely clugged and the other 2 almost clugged. When I put the parts back together, I started to experience the car stalling completely after the car warms up. When the car has been sitting for a number of hours and considered cold. It will idile normally. After the car has warmed up. She will stall when I come to a stop, such as a stop light. Etc..I have a new factory gasket and was wondering if there is a special way the gasket need to replace . Such as any other parts needed besides gasket. Such as gasket sealant etc. Thanks. Serious help needed.