rough idle on startup

srt420psi

New Member
Jun 4, 2007
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when i get in my car in the morning to go to work and start it up it has a real rough idle like it doesnt want to stay running. i usually have to stay in it and pump the throttle a lil til the idle picks up to where it should be. even when i pump the throttle it almost doesnt want to rev up. after that it drives perfect. and it usually only happens in the morning when its like 50 degrees. when i leave work it idles perfect most of the time. its a 2003 gt 5 speed with 35000. what could be the cause?:shrug:
 
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90% chance its the IAC, almost always the problem on cold start with Stangs. Just dont buy a parts store one, get OEM. Also normal maintenence stuff like change the fuel filter can sometimes help.