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O2 sensors on Hondas can only enrich the mixture by a maximum of 14%.Thats nowhere close to enough to flood cylinders or cause a misfire. The reason you getting the misfire codes is because some of the metering ports are clogged causing way too much EGR flow to go to a cylinder causing that cylinder to misfire. Compression will be good and ignition fire will be good as well as feul to that particular cylinder but it will still misfire. We used to drill out plugs on the back of the manifolds to get to the clogged ereas to fix the problem. Thats why I said no cleaner would clear the problem. The carbon in there is as hard as a rock and no cleaner is going to get it out. Once you get it clean a real feul additive like Schaeffer's 131 or Soyshield will prevent it from happening again. Petro chemical sells a kit to alot of Honda shops that will keep those ports clean. You only use it every 15K or so and it's so strong that you hook directly to your intake to feed it in to your intake. Let it sit for about 30min and restart and you'll pi$$ every tree-hugger off within a 3 mile radious from the mushroom cloud coming from your Honda. You will notice the difference when done.