I see that several people have had problems with the Mustang trying to die at low idle. My wife's 05 mustang just started doing this last week. I changed the plugs and plug wires and it still did it. A friend hooked it up to a computer and it said that the MAP sensor and the lower o2 sensors showed a problem. I change all this out and it still did the same thing. One of the post had a link to a manual that said the computer had to relearn the idle after the battery was disconnected so I went through that procedure and it still tries to die at idle. I have cleaned the MAF sensor also to no help. I also saw where some one had adjusted their idle? Is that possible with the electronic control? Anyone please help. CB

 

The idle can be adjusted with a SCT X3 Tuner. The possibility of a bad Throttle Position Sensor might cause the issue. I know when they go bad, it causes the computer to hunt for the position of the throttle therefore causing surges in the idle but it would increase then decrease and eventually die.

 

Thanks, I'll start focusing on the TPS and see if that solves the problem.