"Calibration" tsb?

[VetteGal]

I have a 2006 C6 MN6 and have a real idle issue. After the car reaches a certain temp, the idle screams up to 2200 rpm's and hangs there. If I tap the gas it comes down VERY slowly to about 1100 rpms. It cruises fine but when I depress the clutch to downshift it surges back and forth from 700 to 1100 rpm's. Then when I stop, it immediately goes up to 2200 and stays until I engage the clutch to go at which time it comes back down to normal. It is driving me nuts. I have been told that it is a calibration problem and that GM will have a fix. Everytime it is hooked up to the computer, it reads "vacuum leak" but no one has found that yet. Has anybody experienced this or have a clue as to what I can do. It is extremely annoying to say the least. Thanks for any help.

[c4c5specialist]

HI there,
Possible, but there is NOT any reading for vacuum leak, it would just be data that the technician reads.
Have you ever had a time when the brakes see not as easy to use/stiffness in the brake pedal????
I would suggest that you have them check the vacuum brake booster to see if its leaking.
That would give a very massive vacuum leak and may NOT always show itself.
Calibration is possible, but if there is a vacuum leak, no program in the world will help you.
Allthebest, c4c5

[VetteGal]

Originally Posted by c4c5specialist

HI there,
Possible, but there is NOT any reading for vacuum leak, it would just be data that the technician reads.
Have you ever had a time when the brakes see not as easy to use/stiffness in the brake pedal????
I would suggest that you have them check the vacuum brake booster to see if its leaking.
That would give a very massive vacuum leak and may NOT always show itself.
Calibration is possible, but if there is a vacuum leak, no program in the world will help you.
Allthebest, c4c5

Thanks so much for your help. I am going to have that checked out tomorrow.

Robin