hello friends, 2005 hdi 1.4 206 user, I do not force the vehicle at full speed, it will be rare, when the lights are empty when it is empty, I squeeze it, the problem I will talk about is in the 3rd gear, I get up in the 1st gear, I raise it in the 3rd gear, the same in the 2nd gear, the same time in the 3rd gear, while the acceleration is around 3.3 RPM the tachometer suddenly drops up to 2.2 rpm and then starts to rise again, it is not possible to cut my foot from the gas while the rpm is falling, does anyone know what these friends are?