Hello i need help diagnosing this idle/revving problem i am having with my 2003 honda civic si!
Cold start it will idle at 2000rpms and when it warms up it will bounce between 1000 to 2000 rapidly!
When i disconect the MAP sensor it will idle at 1000rpms
I just replaced the the secondary o2 sensor and it did nothing
It also putting out the code P1166
i checked all fuses and none are blown
Any help is welcome and thanks in advance

 

That trouble code is for the front sensor which is a Air Fuel Ratio (AFR) Sensor not an O2 sensor. I would replace that and take it for a good drive.