Yes denso oem greenI have had a bad IAC valve that caused a very rough idle when cold started. It caused misfire codes. At operating temp it ran fine. A dirty injector can cause out of range fuel trims. I run a bottle of Chevron Techron once in awhile. It has cleaned up the injectors, giving better trim values and stopped misfire codes. Moving #4 injector to a different bank to see if the code follows can give a clue about the misfire. What injectors did you purchase, brand new from Denso?