[Walt Fricke]

I've had problems with my electromotive TPS sensor also. When cracking the throttle from idle/closed position, I've had the voltage go down, not up as it should. Gives quite the wrong message to the ECU. Some fiddling around and repositioning and recalibrating solves this once you catch on. Irritating, though, and I don't know how it could get that way, as it is just a rotary pot.

For race engines, the Electromotive is really quite an easy system to deal with, as you don't need most of the bells and whistles. Can't see it being trickier for a street application, where you want idle stabilization, and part throttle optimization, than other systems.

You can teach yourself to be your own tuner - it is not like you are reprogramming a chip, just changing values in tables, which you can do at the chassis dyno with your laptop, and then see how they work. And you can check them again on the street, even change settings from the passenger seat driving around.