ever since i got my b16a in my hatchback its had a idle problem ..the idle will surge from about 1000-1300 and keeps going on like at stop lights and when my car is just ideling i was told that it was because i was using a single wire o2 sensor so i bought a 4 wire heated and put it on and it still does it .....although i did notice that i was leaking coolant out of the hose that goes into my firewall im pretty sure that its for my heater because whenever i have my heat on i notice a little coolant around the hose....... any help would be greatly appreciated

any help would be appreciated

 

check for vacuum leaks and take your IACV out and clean it.