I have a v4 wrx, and it has a bad idle (idles around 500rmp, some times stalls or very rarely idles at about 2000rpm). When the car is cold, or just started, it always idles fine, but with in a few minutes of driving it goes back to its bad state.
I have tried:
2 ICV bodies, 3 ICV tops
3 ecus
2 water temperature sensors
Unplugged the o2 sensor
The engine has be rebuilt and bored out to 93mm, could this be doing it?
Also some times when I put my foot down it dose not seem make to make much power, even though it still reaches full boost, I have theorized that the ICV has stayed open.
Any suggestions would be much appreciated
Thanks
Gregory