If your vehicle has a direct-injected engine, you're likely overdue for a carbon cleaning.
Carbon builds up on the intake valves as fuel is sprayed directly into the combustion chamber, leaving room for deposits to build up.
Performing a walnut blast on the intake valves will remedy this issue by spraying tiny fragments of actual walnuts - ground down to sand-like in look and texture - directly onto the valves themselves. The media will slowly remove the carbon deposits built on the valves, improving the engine's overall health and performance.
To walnut blast at home, you need the proper tools and mechanical knowledge. We do offer Walnut Blasting Kits, however, they're not offered for every direct injection vehicle. You can purchase a media blaster found here, and the media can also be purchased here.
Feel free to give our blog post on this topic a read, which can be found here.