Engine Idles Hard after 1 sec.

[Chew_12]

Ok I live in Flagstaff for college which is at 7000 feet altitude. When I start my car after 1 second that it has started it will jump to 2000 rmps then go back to normal. It hasnt always been like this. Also after I travel about 150 miles to Chandler once I turn off the car then come back and turn it on, it will idle from like 2000 to 300 for a couple of seconds then it will go back to normal. Could this be caused by going from 7000 feet to 3000 feet altitude? Im thinking that my IAC is going out. What do you guys think?
Thanks

 

[Joey P]

Yeah check the IAC. That is probably it. Also check the EGR valve and the EPFE, (EGR Pressure Feedback Sensor.) I seriously doubt that the altitude is causing it. You could also disconnect the battery and reconnect it trick.