Skip it. There are real fuel additives out there, there is no 'one can, fix all' type of stuff. Snake oil is good, but I would call it something on the terms of Horn Oil or Carburetor Belt.
Intake buildup can be rid of over time with just slightly more aggressive driving. i.e. going WOT and keeping it there on the freeway and other places where safe/legal when the motor is at full operating temp.