Clean the Idle Air Control Valve. It's on the throttle body below the throttle position sensor. The IAC is like a giant needle valve that has a 4-pin connector on the back side of the throttle body, nearer to the firewall. It's hard to see, often overlooked, but easy to remove, clean with a toothbrush and any spray type choke cleaner. It's held on by two torx-type screws. I can't remember what size--dropped and lost the bit.
I fought this problem for two months and spent over $300 on tools and parts only to fix the problem with $.25 worth of spray.
Thursday, October 15th, 2009 AT 6:33 PM