RPMs jump when car in park (video inside)

[NewMStang]

Eversince i replaced my plenum, intake, and TPS (i've gone through a few) I've had an issue with my rpms jumping when i place my car in park (obviously i have an auto). When I place the car in drive the car idles at about 500-600, when i shift the car into park the rpms jumpt to about 1k and then go down to about 750, anyone have any idea what can be wrong here?

Here's a video of what im talking about (sorry about the bad quality)
YouTube - CIMG3135

And while i was out there i took a small clip of what my exhaust sounds like:
YouTube - Mustang GT - BBK Catted X-pipe and flowmaster catback

 

[BurningRubber]

I don't see anything wrong, per say.

Is you A/C on in the video? Having the compressor running will cause the idle to jump around a little more than with it off, since there is more load on the engine. I have noticed this on mine every time I run the A/C and I am at idle (but I am a 5 speed).

Have you replaced, or tried cleaning the IAC (idle air control) valve? It's the silver canister looking part on the front side of the intake plenum. If you clean it, use electrical cleaner or electronic parts safe throttle body cleaner.

 

[VEE EIGHT]

Looks normal to me. My RPMS hover just under 1K when in park too, then dip down to 750 when in D

 

[Brute03]

i see the problem - it's an auto

seems normal to me, just about every auto car i've driven did that

 

[scupking]

It's normal mine does it to. I also have an Xcal2 so I can change the idle to whatever I want. I actualy have mine set at 750 right now and 850 in drive.