I haven't visited this thread for a while, and honestly just been dealing with the issue. It's exactly as @cmitchell17 describes - I don't know how I would daily this car if I had a commute with any slow moving traffic. I went to the dealer and everything checks out of course, no issues.
Recently I decided to pick up the troubleshooting again, so I did some data capture with VCM Scanner. After many smaller blips and dips, I captured a decent one that I did not call for with the accelerator. See the image attached.
Blip1 shows a very quick tap on the accelerator. Looks normal, except there was no input like that from the driver. I was performing some slow coast-down and slight throttle application to sustain speed (that's when the blip normally happens). The accelerator reading rises from 19.2% (idle) to 35.9% and drops back down to 19.2% in about 200ms. Interesting to see that the car is actually responding to what it believes is an accelerator input, and it's not just a throttle movement gone rogue. This is different than the blip for downshifts, as there is no accelerator change during those (and of course the revs rise, this blip is too short to make engine speed jump). I have already replaced the accelerator pedal with no change, and I don't expect it's the pedal because the problem would be much more consistent.
This is discouraging because if the system is reading accelerator input when there is none, that's not going to improve with a tune adjustment. Only hope I think is to bypass the existing wiring harness direct to the control module? Is there a TAC module to replace in these cars?
Not all complaints - So great on track, especially after replacing the radius rod bearings with spherical.
