cliffconggin thank you for your answer.
Once I take my foot of the gas pedal (in 5th) it makes an continuous like grinding or whistling noise I'm not sure. I had a brand new clutch kit installed 2 days ago I don't know if that has something to do with my problem cause I bought the car like a week ago. Today I also put an gearbox additive and faced a new problem, when I'm in 1st gear and stop it stucks and I can't go in nutritional, I had to turn off the engine and it disengaged like nothing happened (it happened 2 times as I parked).