I did the fuel tank and engine oil treatment.
I would like to do the intake treatment too.
Does anyone have experience with this? How to do it? Is it a good idea?

 

Depends on your goal. Are you looking to clean the inside of the throttle body (not sure how much that would change anything) ? The components I'd look at are the MAF - which is sensitive the the cleaning agents used as they can leave deposits on the wires so I'd use CRC MAF cleaner there. The other part is the idle air valve - if you have the MAF cleaner already, use that, otherwise standard carb cleaners can do the job. The Seafoam treatment usually implies sucking the cleaning agent via a vacuum line, which if upstream from the MAF, can create problems...