Hello. I have a new GP (with Starjet engine) from June. From the time I got it I had a very strange problem (among others). The car is not performing well when the weather is too hot or too cold. Also the sound of the engine is different when this happens (it sounds very rough). In order to describe it better the car performs like pulling a big trailer. Sometimes when this symptom is very intense the car cannot go more than 80km/h. There is no indication in the dashboard or at the examiner of the Dealer. Everything seems normal. Every time I pull out the black pole of the battery the car seems to be ok for some km. Also the dealer has reprogrammed it and again the same, the car is ok for some km. I have to mention that this happens usually after the temperature of the engine goes to the middle. Does anyone had a problem like that? Any ideas of what this could be?