weird idle

The last I'd say 6 days my idle has been acting wierd.. when I first start driving my car the idle will be around 750 to 800 rpm, but then jumps up to 900 and 1000 and stays there, and will not come back down till I let my car sit with the engine off for a while. Any idea what this could be?

evac? vacum leak?

and i forgot to mention that the rpms like to jump from 800 to 1000 up and down constance.. but as i said shut it off and let it sit for say 15-20 minutes and the idles are normal again :S

it might have a slight misfire, but i would say that you probably have a vaccuum leak. Check the PCV valve and all the vaccuum connections that you can find, otherwise bring it into a shop and have them run a vaccuum test or a diagnostics test.

couldn't be a vacuum leak, because it would remain there after he started back up from letting it sit, how many miles? and whats your prev. maint. look like?(did u do all your schedl. maint?)i.e. wires, cap rotor,...but sounds to me like a dirty iac

Its has 28 000 miles on it, all maintance has been done, just installed a cold air intake a few weeks ago

Hey...that Might Help.....double Check Everything U Did...sometime My Car Does It After I Diconnect The Battery, Then The Ecu Re-learns Everything And It Stops...but 6 Days Is Kinda Long..

I'll give that a try see if it makes a difference, plus i am getting ngk iridium spark plugs so tomorrow when i get a chance to install them hopefully everything goes well.