need help my s sputters at idol. it drives fine just at idol you can feel it and hear it sputtering. i let it idol for about 20 min last night to see if would throw a code and it did and i thought it was o2 but when i checked the code it threw a miss fire on 123 and random miss fire. i replaced the plugs about 2 weeks ago with ngk hoping to fix it but it didnt. i put some fuel intecter cleaner in it tonight but not really thinking it will help. please throw some ideas out there or hopelly u ran into this before and can help me

 

possible bad coils.
MIST them with a spray bottle of water and see if it misses.