I had exactly the same problem, I just merely flicked the steering and the ESC would punch forward, then flicker "full brakes". My PT light went REALLY low, and the loop was right at the beginning of the straightaway so it missed laps all the time when I accelerated.
It was always like that, even with a crappy JR or Hitec servo, but I think it really got bad when I replaced the damaged lead with another, but couldn't open up the case, so I just soldered the three wires together with the existing ones.. maybe a bad soldering job, who knows.. but I soldered in-line a 1000uF capacitor, which helped immensely for my TC, then soldered another 3300uF capacitor to an old receiver battery connector for my 1/12th, and I've run without missed laps nor glitches.
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