19th Nov 2011, 12:19
I know your post is very old, but this may help someone else experiencing the same problem with the car idling. You may want to check your idle air control valve to see if it is dirty or clogged in some way, or replace it all together. It could be the source of the issue.
29th Jan 2016, 21:23
I've had the exact same problems with my 2001 GT-S and haven't been able to solve the problem so far. Let me know if you found a solution.
4th Oct 2011, 20:00
Try the coolant temp sensor, you can check the resistance output from the sensor with a multimeter. If I remember rightly, the resistance should drop as the car warms up as it is an NTC sensor. If it does not drop steadily or does not change at all, I would say that's ya problem.