ya there is a bultin about the fast idle thermo un screwing inside you could try removeing the 3 screws on top of it and screwing it back in with a flat head be gental.then undew your battery for a while and then hook it back up run engine till the collent fans run twice this will give your computer time to re learn ist idel.(the fast idle thermo is on the intake next to the drivers side two collent lines runing to it).i have also seen the iacs get stuck.