There are a few ways you can add the de-carbonizing fluid. Some auto parts stores, sell a plastic bottle with a hose and a valve, which you control the flow of fluid with. Some back woods mechanics claim, that all you have to do, is pour a cup of water into any vacuum line on the intake and that will get rid of all the carbon, like I stated before, I've never seen good results from this. At the shop, we have tried all sorts of things, just to see what kind of results come from it, transmission fluid, acetone, alcohol, coolant. Most of the time, the results are marginal.
The winner of all of these tests, by a mile, is GM top end cleaner. I'm not sure if you can still get this stuff. I've seen some on the shelves of Old Mom and Pop parts stores, but if you can't easily get your hands on this stuff, look for "Sea Foam engine decarbonizer" My next choice is CRC chemicals.
All of these can be applied with a plastic soda bottle and a rubber or plastic hose. An appropriately sized hole is poked into the bottle and the hose pressed into the hole. with contents added, the plastic bottle can be hung via tape or a wire hanger, upside down over the intake manifold, near the throttle body. Removing the vacuum hose from the fuel pressure regulator and hooking your decarbonizer bottle to the vacuum port on the manifold, with the engine running at 2500 RPM, you can regulate the flow of chemicals, by clamping a small pair of vise grips on the hose going to the manifold. You want plenty of flow, but not enough to choke the engine. It is normal, for the engine to run rough during this process.
If you get stuck, re-post and I'll try and fill in any blanks I might have missed.
TVS Supercharged SVO 2.7L
561 ft lb