High idle at times

[crbquist]

Lately upon starting my car it will begin to idle at 1500 and then keep increasing. It has gotten as high as 2500. It will stay like this for a while, then drop back down to normal. It runs and drives fine and is not throwing any codes. Maybe my crank position sensor is going bad? PCV?

[97gtsc]

Throttle position sensor or idle air valve going bad?

[shawngtp]

Battery voltage is low or your alt is starting to go bad. Your pcm is not seeing the correct voltage so it rases your rmp's untill it sees it. Just my 2 cents I could be wrong..

[Bio248]

could also be a dirty IAC.