Ive had this trouble for a while now and i cant seem to fix it. My car will start up and idle high at about 2.3k then if i hit the gas itll go back and forth between 1500 and 2000. Ive cleaned the IACV and put a different one in there. Ive also throughly cleaned the fast idle valve. And the most recent thing was i put a new coolant temperature sensor in. Could it be that my car is running on an ecu from a different car? Idk what car its from but its not an integra one im pretty sure it says P0B on the outside of it and im pretty sure 93 integras are supposed to be P74s

 

bumpp

 

The correct ecu for your car is a PR4.

Have you checked carefully for vacuum leaks?

 

yeah i looked and listened for them and i plugged the top hole in the intake manifold and the car stalled out could it be air in my coolant system possibly?

 

Air bubbles are a possibility it can take a long time to get them all out.

Easiest way to check for a vacuum leak is to spray carb cleaner on hoses, gaskets, etc.

When you cleaned the fitv did you also make sure that the inner piece was screwed in enough?

 

yeah i screwed it in all the way which is where it was when i took it apart

 

i think it might be the iacv i have on there i unplugged it and it idles fine but doesnt rev past like 2000 the iacv i put on there looked pretty old but in better conditon than the one i had on there already

 

check your o2 sensor