My car is a 2011 model with 5008 HDI engine. Mileage is 180 thousand. The pressure plate was changed at 125 thousand. Our problem is that while driving on the road with normal gas, when I want it to accelerate and touch the gas, the rev counter suddenly goes up to 3 thousand and a gear change occurs. Then, when I take my foot off the gas, it returns to normal speed. It does this in almost every gear. Has anyone experienced this? I am in Kocaeli. Do you have a recommendation for a good mechanic?