Cold Startup Problem (First time)

This morning I started up my car after it sitting overnight and when I started it up the RPMs dropped down below 500 or so and then it stalled out immediately. The car would not stay on unless I held the throttle down. This is the first time this has happened since I've had the car (about 1 month) and it wasn't particularly cold outside this morning, probably around 68 or 70 degrees. Well I drove the car about 3 miles back to my apartment (it was in a garage that it could get towed in) by braking with my left foot and holding the throttle at 1000 RPMs at stop lights so that it wouldn't stall out. By the time I got back to my apartment, about a ten minute drive, the car was fine: I let my foot off the gas and it stayed idling like normal. This obviously isn't a huge issue since the car stayed on after being warmed up a few minutes but what could I look at to ensure the car won't have any cold-start problems in the future?

wmburns said:

Possible IAC problem.

Basically the same problem as GDawg (same diagnostic procedures).

http://www.stangnet.com/mustang-forums/800824-high-idle-anyone-wmburns.html

Do you have a ODB2 scanner to monitor the IAC percent? Turn the AC on/off and verify that the percent changes.

Consider cleaning the IAC (although it may only be a temperary fix).

Click to expand...

Sorry I don't know what the IAC is. That thread seems to be about high idling problems whereas mine was just temporarily stalling out at idle. There was no jump in RPMs or anything, it was just that I would turn it on and if I didn't press the gas down it turned itself off. Then 10 minutes later it was fine.