after 3 weeks of tuning my ls/vtec build i decided to clean my iacv, i put it back on and the car ran awesome all day until tonight, as i downshift the rpms buck and the cel comes on, now the motor idles a little over 2k and stays there oh and i cant check for codes on my setup.

 

why is this in the All motor section?

what model car and what year?

why cant you check the cel?

 

If your iacv was dead. Your motor wouldn't idle at 2,000 rpms.
Check your codes or take it to some one that can.