I own a 2009 Honda Pilot and had the misfiring on cylinder 2 at 158,000 kim (100,000 miles) . I took it in and they replace all the piston rings and flashed ECM under the extended warranty. Then at 181,000 km, cylinder 2 misfired again going up a hill in a high rpm situation. I would shut the engine off, the engine light went off and it quit misfiring. I limped it home from the trip we were on, as it repeated this several times. You would be running in ECO mode and then go into a high RPM situation such as climbing a hill or coming to a corner and taking off again. Each time shutting the engine off stopped the misfiring and engine light would go off. When I made it home I took it in to my local Honda and the mechanic figured that it was the rocker arm was not shifting back after being in ECO mode and then being put into a high RPM situation would cause the misfire. They would not warranty the repairs ($5000) because the engine was over the 8 year/ 160000 km extended warranty. I decided to purchase VCMuzzler and it has not misfired since. Worth every penny!!