Fuel injector cleaning is high up on the list of a dealership's money makers. It's easy and cheap for them to do and they can sell it at a significant premium Also you can pick up a can of throttle body cleaner for $10 and clean the throttle body yourself, very easy to do, lots of guide on how to do it. The can of cleaner will last you many i4TpRPH.

do it yourself fuel injector cleaning