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I got this code P0507 on my Civic EX 2006. I had previously the codes P1129 and P0497. I have an idle problem; when the car is in parking, it stays running around 1500RPM. Driving, it can stay around 1500 when I am under 50m/h, 2000RPM if I am between 50/65m/h, and above 2000RPM when over 65m/h.
I made the mistake of searching for the code and car together, and the IA (it is all IA now) keeps saying that I have a problem with the IAC. For what I found out, the 2006 EX 8th gen does not have IAC anymore. So, it has IAC or not? IAC or IACV? I almost forget that I tried the "relearn" several times, without any changes.
Any suggestions?

 
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Try doing a throttle relearn. Youtube it maybe it will help. And look for vac leaks