Im checking the computer tomorrow to find out exactly whats wrong, but my idle has been stupid lately. When i turn the AC on, i lose about 500 RPM, and more recently when i let off the gas, it goes way down to about 200 rpm, then up to about 1200, then usually stops around 1300. Im pretty sure its the idle air control valve, but any other ideas what it could be?

Also, does anyone know how the idle air control valve works, or what it even does?

 

I would say check your MAS

 

im kinda thinking with sebba, sounds like a mass air problem or definetly a sensor. either the tps, cas, or iac