What should the normal idle be at? When my car is in park, it changes. It will be around 850-900 and about 5 seconds later, will jump back up to around 1000-1100. A few moments later, it will go back down and then up again. Any reason why it's doing this?

 

Your Mass Air Flow sensor might be bad. Mine does that occassionally.

 

At first I was gonna say your a/c compressor might be coming on and off, but 1100 or so seems way too high for that, I agree w/the above

 

Yea i agree with the above too.

I think you can just unplug it and start her up and see if it still does it......should run on the pre-set parameters and see if it clears it up. Plug her back in and see if it does it again.....if it does, it's probably bad.

Make sure your foot's off the throttle lol