I am trying to diagnose/check my Throttle Position Sensor, I have searched Blatchat but can't quite seem to find the info that I think I need relating to a Sigma 125 2013 vintage, standard single Throttle Body. I have a little problem when the engine is idling, applying the throttle pedal the car seems to stutter and kangaroo momentarily resulting a bit of a jerky moment. Once the pedal is pushed a little further it seems to be fine. So I have been looking at the TPS using Easimap and monitoring the Throttle Site and Throttle Angle and trying to figure out if these are correct. I am no expert in this so apologise for my potential numpty questions. As I understand it the TPS is basically a variable Resistor and the ECU measures the voltage at the wiper which essentially gives the Throttle position (I believe this is the Throttle Angle in Easimap). This is then related to a Throttle Site. So using Easimap with ignition on but car not running I seem to have a Throttle Angle that seems to flicker between 0.4 and 0.39 (occasionally 0.41). This then seems to result in a Throttle Site flickering between 0.1, 0.5 and 1.0. I have also noticed that the Throttle Site can flicker between 0.5 and 1.0 without the Throttle Angle voltage changing. I have also managed to get to Throttle Site 0.0 (Throttle Angle indicated 0.39) momentarily. My question is, are any of these numbers/readings correct. If not does anyone know what they should be so that I can possibly adjust the TPS so that I am in the right area. I suspect that the TPS needs replacing so any setup info would be most helpful. Many thanks. Nick