everytime i come out of gear my rpms stick in between 1200 and 1400 and then finally goes down only after im at a dead stop for a few seconds.


i have done the following:

took off intake and cleaned throttle body
cleaned iac valve
replaced tps
and no luck yet

 

Mine has a similar issue, but seldom is above 1000 rpm. My service manual talks about a relay that reduces fuel pressure at idle and I can hear a distinctive click just before the engine idles down. I replaced the relay when I was troubleshooting a phantom engine shutdown. It is located in the right glove box/kick panel area. If the idle is going down, I would guess it's working.

David

 

so the throttle body was the problem! friggen ford says not to clean your throttle body they mean it!

 

You need an IAC restrictor plate. it will reduce the flow of air through the IAC and that allows the engine rpm to drop faster when you release the throttle quickly. Ford use to make iac adjusting plates that went between the IAC motor and the intake.

They don't want you to clean the throttle body because it has a coating that can get damaged.

 

Tell us more about these plates. I could easily make one if I knew what size the holes were.

 

ah, that magical search button.

https://mustangforums.com/forum/4-6-...ging-rpms.html

 

it had nothing to do with the iac, i changed the throttle body and the problem was fixed