high idle at start up

[Sump]

Has anyone had there car sound like a 70model chevelle with a cam when it starts up. My 2001 mustang does especially with flowmasters and no cats. Just wandering if anybody else has had this problem or knows how to fix it.I have already replaced the TPS.

 

[OxMox]

All you have is flow's with no cats? or do you have a cam... nevermind, I got it. I don't know why it does that. Mine does that from time to time, check to see if have an exhaust leak. My stang started doing that right around when I got an exhaust leak. Just a thought.