Stalls when shifting into park

[redbaron]

This morning when I got to work and parked my truck it stalled when i put the gear selector in park. Any ideas? I've seen a couple of posts that blame this on a bad IAC is there a way to confirm this is the case before replacing it?

Also, I put a K&N FIPK cold air intake on a little over a week ago. I've checked it for air leaks and it's on there good and tight. Could this have something to do with it?

Truck is a 2004 Fx4 II 4.0L auto.

 

[BlueChariot]

I'd try adjusting the idler, after replacing the fuel pump my truck had a similar problem where it would sometimes shut off at idle speeds.

 

[redbaron]

I'd try adjusting the idler, after replacing the fuel pump my truck had a similar problem where it would sometimes shut off at idle speeds.

I don't think the idle is adjustable on the '04. What do you mean?

 

[BlueChariot]

I don't think the idle is adjustable on the '04. What do you mean?

In my last truck there was a bolt on a spring that you could tighten/loosen to adjust the RPMs at idle.