1998 navigator stalling

I have a 1998 Navigator 5.4 that is stalling occasionally when you come to a stop. I replaced the #4 coil pack as read on the code scanner and also the IAC Runs a lot better on all 8 but still stalling. Any ideas?

I have a 1998 Navigator 5.4 that is stalling occasionally when you come to a stop. I replaced the #4 coil pack as read on the code scanner and also the IAC Runs a lot better on all 8 but still stalling. Any ideas?

Any fault codes present? I would connect the scanner anyway just to see if there are any pending intermittent faults stored.

Towncar took the words right out of my mouth.