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I have not found a solution to the problem. It may or may not have gotten a little worse since I posted but I have not been driving the car much lately so I am not sure. It sure feels like a problem either in the pedal sensor, or possibly the electroic throttle itself. I did read a TSB that said if you have a certain throttle (it had some numbers) that it needed to be replaced with an updated version AND the wiring harness needed to be replaced too. I'll be sure to let you know if I ever figure out what's wrong with it. PLEASE let me know if you find a solution.
I read one of your posts about jerky throttle response (from a while back) and was wondering if you ever found a solution. So many of the people I have talked to don't seem to understand the issue. Your description matches mine exactly...
I've already had the "improved factory software" and a new updated pedal installed. Didn't make any difference.