1997 3.8 liter V6 throwing P0430 code

[1996droptop]

car runs n shifts nice but at an idle in R or D its idles rough any body else have this problem with any insight i would love to get a quick fix tip

 

[bigcat]

check out this link...
http://diagnosticnews.com/tech/catalytic-converter-tech-feature-diagnosing-p0420-or-p0430-dtcs/