Having a problem my idel stay on 2 in stead of 1 but then my coils misfires change coils plugs and it still the same .some time it work fine for about two min. What else could be the problem

check the wires and check your plug holes and see if they are oily inside most likely it could be many different things but clean out the plug holes with engine cleaner and snug plugs make sure plug caps are clean getting good connection also big thing check and make sure there were they suppose to be I did this once to a Toyota 4runner wrong wiring to wrong plug originally that's what happened to me if not check for leaks or suction to airflow management system hope helps