2007 TBSS log+video: I have the worst throttle hang-up without going WOT on it's own?

[WarWagon]

I want to know if anyone has ideas of what causes this on mine and a few other 2007+ TrailBlazer SS and not other 2007's. If I let off the brakes when the engine speed hangs up my TBSS will accelerate on it's own.

I will answer this 1st: IT IS 100% BONE STOCK! Not even a fancy air filter. This is on the factory tune.

If you get on it, doesn't have to be WOT, and then try and stop you are likely to run into this hangup. Over 70 degrees and AC clutch running, not just AC on, while trying to stop is the worst case. AC does not have to be on for the hang to happen. Happens in all gears including 4th at freeway speed. Slightly worse in manual 3rd etc.

1st take off ac on.hpl says it all. Frame 551 has the engine RPM exceed the Trans input shaft RPM while slowing down and no throttle pedal applied - it is at 0%. This is the start of acceleration if the brakes are off. The other two logs do not have trans input shaft speed.

(Video's are not logged as I can't run both laptop and camera.)

Video 1 (5MB) is the acceleration letting off the brakes. ~500 RPM increase with no throttle.
http://members.cox.net/ttllc/tbss/1.mpg

Video 2 (5MB) is the attempted acceleration with the brakes on to a full stop and the violent throttle reduction when speed = 0 MPH. The Computer is literally power braking when coming to a stop and suddenly kills power - the lurch you see in the video.
http://members.cox.net/ttllc/tbss/2.mpg

After logging the ECM is simply not closing the throttle. I am down to a sensor being out of calibration or a defective in design program/factory tune. Reducing/changing the "final idle airflow minimum vs RPM vs gear" table in HPTuners helps 'cure' this problem. However, my TBSS doesn't do this all the time. I feel because of that there is a performance or abuse mode that either adds to this table to prevents the throttle from closing.

The history is here.

http://www.hptuners.com/forum/showthread.php?t=17291
http://www.hptuners.com/forum/showthread.php?t=18179

[dcpatters]

I'm guessing it's been to the dealer and they said everything is A-OK? How about comparing some of the factory calibrations from the tune repository? I've seen a few there. I can send you mine as well.