UK Car Repair: 1995 Jag XJ6 Intake Plenum, vacuum line, intake plenum

Question
I have used a product called Seafoam on all of my cars to clean intake and injectors. By introducing the product  to a brake booster vacuum line or PCV vacuum line thus behind the fuel mixture ultimately injecting it through the intake and injectors. I can't find an "obvious" vacuum line on the Jag. Any assistance/advice is greatly appreciated

Answer
I have heard of it, but never used it.  In over 30 years of working on fuel injection cars I have never cleaned a petrol injector. On a car that is used regularly, I do not think it is necessary.  I use a proprietary cleaner to clean out the throttle body on Jags as this is where the build up usually occurs. If you reaally wanted to get a manifold vacuum point you would have to drill and install one.