Idle Surges when In Park???

[joshheat25]

I just bought a New IAC. My car after I drive it and its Hot. While sitting in park it will idle at about 800 then it slows down to about 400-500 and acts like its going to shut off. Then bounces back up to 800. It only does this when hot. I dunno I am not throwing any codes or anything any ideas???

 

[joshheat25]

Anyone with any Idea?

 

[LaserRed01GT]

Could just be that you need to clean the MAF. Another common problem of inconsistent idle issues is vacuum leaks. Do you have the ability to datalog or scan?

 

[the98stang]

You might have gotten a bad IAC. Did you buy a motorcraft one?

 

[joshheat25]

Yes! I bought a motocraft one! I think it's a vacuum Leak.. I dunno I am going to have to check somewhere I guess