Idle issue in park

[john95 5.0]

hey guys, I'm having a problem with the idle on my car ans was hoping you guys could help me out. Driving around town the car is just fine but when i put the car in park the rpms shoot up to 1500rpm? What could cause this? is this something as simple as a vacuum line?

Thanks, John

 

[Noobz347]

It could be. I'd also take a look at cleaning out the IAC (if it needs it or not), and disconnecting the MAF sensor and TPS to see if there is an idle change.

The simple stuff aside, take a look at JRichker's, "Surging Idle Checklist". It can be found in the Index sticky at the top of the 5oh technical forum.