2012 Civic: possible misfire, no codes

[jakenelson09]

Just got a 2012 EX sedan with 36000, and have put 8000 since Jan. When idling I feel like there is a misfire going on, but no CEL or codes thrown. I've changed spark plugs, but no difference, and discovered that there is apparently no fuel filter that is accessible. Any ideas on what might make it idle smoother?

 

[HockeyZombies]

I would run gumout all in one fuel system cleaner with top tier fuel from QT or BP or Shell. It could be bad fuel or fuel that sat too long. Check throttle body and clean with CRC IVD cleaner. Its made for GDi engines but has same additives(PEA) as found in Gumout Regane cleaners. It really works. Take it out on highway...if it cuts out could be fuel pump. Stay away from seafoam; it adds alcohol and does nothing. Check Msds sheets for poly ethyl amine, that is a nitogen based cleaner that works. Its too soon maybe,but cat might be acting up too. If its misfires oft,check distributor and wires gone south. Take a mist bottle and spray on wires while car is running, if you see sparks then replace. Good luck