Fiddling with my IMRC control cable and cleaning out the secondaries
 

I've read about one person taking the extra step of disconnecting their IMRC control cable and holding open their secondaries when seafoaming their engine. Would this apply to my 02 Taurus SES 3.0?

If so, where is the IMRC cable disconnected and how do you hold open the secondaries?

And does adding this step require the seafoam be fed in through a particular vac line, or would the good old brake booster line do?

Thanks