Our database does not have any information for your vehicle so I hope what I have for you is applicable.
I don't know what the mechanic adjusted but if it is for air fuel mixture adjustment, it is not as simple as tweaking around. You would need a 4 gas analyser to do that to be accurate.
I need to know the idling speed as it could be related to your problem and since you are having correct idling speed, the problem lies with the cold (fast) idle system which is actually computer contyrolled and you cannot make any adjustment to it. The component likely to cause this problem would be with the by-pass air valve. It could be clogged or not functioning correctly.
Have you checked for trouble codes?
Saturday, June 16th, 2012 AT 1:23 PM