It happens in all three pedals. It always goes back to zero immediately upon pressing another pedal. I spent about thirty minutes testing and this only seems to happen about 2-3 percent of the time. Sometimes the opposite happens: a pedal might not register full input. This is more rare. I know the pots aren't dirty -- dirty pots are "spiky". These are stable. I have three theories: 1. Inadequate shielding or grounding. 2. I leave the bottom unscrewed for easier access for cleaning and maintenance. Maybe tightening it back would fix it. But I have to find the screws... 3. Perhaps I'm simply expecting an unreasonable level of accuracy. Being that the problem corrects itself as soon as another pedal is modulated, the only time this would affect my lap times is when it doesn't register full throttle input at the beginning of a straight, and I don't notice it. Your thoughts?