P0411 code and Seafoam question

I just recently bought a 1996 Cobra Convertible and it's currently sending out a p0411 code. Whats the typical procedure to diagnose what needs to be fixed on this car? I'm thinking about running some seafoam to clean out some of the carbon... what is the best line to feed the seafoam for this car?

Thanks
 
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I personally wouldn't use seafoam to try and fix a 15 year build up of carbon but if you want to... use the main PVC line on the driver's side.
Chances are you'll need to clean/replace the IAC, EGR, and IMRC system.