Hey, I did this cylinder de-carbonizing today and wow it really works. Engine was smoother and when accelerating, the first 3 gears were pulling really strong. Basically its a really easy and cheap maintenances to DIY.
WARNING: Do not stick the whole hose down and suck up the water too fast, you will blow your engine.
For further infor how to do it pls look into this link provided by one of bobistheoilguy forumer.
http://www.automotiveforums.com/vbulletin/...ad.php?t=283211